im getting the same issue

Same here. I go to hack the broadcast relay, it pings the locked vault quest, but immediately moves it to the completed/expired pile and doesn't do anything otherwise.

Not sure how much this helps but: i spawned in a vault using the dev menu, and the guardian didn't spawn at all. The only crypto-coffin came with someone from the wrong ideology who I am not even sure was an ancient.
I think there used to be a similar issue before where the faction didn't spawn in, maybe the same here?

-----------------
Id: 70
State: EndedUnknownOutcome
Data:
<saveable Class="Quest">
<id>70</id>
<name>Treasure Hunt to the Hidden Vault</name>
<appearanceTick>9329871</appearanceTick>
<acceptanceTick>9329871</acceptanceTick>
<acceptedBy>null</acceptedBy>
<ended>True</ended>
<cleanedUp>True</cleanedUp>
<cleanupTick>9329871</cleanupTick>
<initiallyAccepted>True</initiallyAccepted>
<challengeRating>1</challengeRating>
<description>We've intercepted messages about a sealed vault not far from &lt;color=#00BCD8FF&gt;The Ice-Blood Throne&lt;/color&gt;. The site is full of ancient technology and relics.

It seems that it is still defended by ancient soldiers.</description>
<root>VFEA_OpportunitySite_SealedVault</root>
<signalsReceivedDebug IsNull="True" />
<parts>
<li Class="QuestPart_Letter">
<inSignal>Quest70.OuterNodeCompleted</inSignal>
<letter Class="StandardLetter">
<ID>375</ID>
<def>NeutralEvent</def>
<label>Quest expired: Treasure Hunt to the Hidden Vault</label>
<lookTargets IsNull="True" />
<relatedFaction>null</relatedFaction>
<text>Intercepted communications indicate the sealed vault has been opened and scavenged by others. The quest Treasure Hunt to the Hidden Vault has expired.</text>
<quest>Quest_70</quest>
<hyperlinkThingDefs IsNull="True" />
<hyperlinkHediffDefs IsNull="True" />
</letter>
<useColonistsOnMap>null</useColonistsOnMap>
<colonistsFromSignal />
<visitors IsNull="True" />
</li>
<li Class="QuestPart_QuestEnd">
<inSignal>Quest70.OuterNodeCompleted</inSignal>
<outcome>Fail</outcome>
</li>
<li Class="QuestPart_WorldObjectTimeout">
<inSignalEnable>Quest70.Initiate</inSignalEnable>
<inSignalDisable>Quest70.site.MapGenerated</inSignalDisable>
<outSignalsCompleted>
<li>Quest70.OuterNodeCompleted</li>
</outSignalsCompleted>
<state>Enabled</state>
<enableTick>9329871</enableTick>
<delayTicks>1680000</delayTicks>
<expiryInfoPart>Expires in {0}</expiryInfoPart>
<expiryInfoPartTip>Expires on {0}</expiryInfoPartTip>
<inspectStringTargets IsNull="True" />
<isBad>True</isBad>
<alertCulprits />
<worldObject>null</worldObject>
</li>
<li Class="QuestPart_QuestEnd">
<inSignal>Quest70.OuterNodeCompleted2</inSignal>
<outcome>Unknown</outcome>
</li>
<li Class="QuestPart_NoWorldObject">
<inSignalEnable>Quest70.Initiate</inSignalEnable>
<outSignalsCompleted>
<li>Quest70.OuterNodeCompleted2</li>
</outSignalsCompleted>
<state>Disabled</state>
<enableTick>9329871</enableTick>
<worldObject>null</worldObject>
</li>
</parts>
<tags />
<parent>null</parent>
</saveable>

Active QuestParts:
QuestPart_WorldObjectTimeout (quest.id=70, index=2)

this is what dev debug mode is saying it works with looted vaults but not the sealed vault and when i try to spawn the sealed vault quest in with dev mode it says (NOT NOW) next to the option if it will help i can screenshot and post it here and i only post this here and i cant find the google bug thing sorry

same here when i hack the broadcast station in a looted vault the sealed vault quest instantly finish has soon has it pop and no sealed vault spawn

Not sure this helps, but I'll say it anyway in case it does:

- When you hack the broadcast station it also no longer despawns.
- If you do spawn in the site on the world map, you can access the vault, but the defending soldier is missing, plus, everyone inside a stasis pod is from the wrong faction.
- At least for me it stopped working after one of the VFE Mod updates, the first vault still worked, but also didn't have a soldier in it.

I also have the same problem. I run only Harmony, all of Rimworlds official contact, VEF, and VFE - Ancients and still got this problem. Here the log that generated.
RimWorld 1.5.4066 rev841
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
RimWorld.VersionControl:LogVersionNumber ()
Verse.Root:CheckGlobalInit ()
Verse.Root:Start ()
Verse.Root_Entry:Start ()

MVCF successfully applied 0 patches
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
MVCF.Patch:PrintSummary ()
MVCF.MVCF/<>c:<CollectFeatureData>b__15_0 ()
Verse.LongEventHandler:ExecuteToExecuteWhenFinished ()
Verse.LongEventHandler:UpdateCurrentAsynchronousEvent ()
Verse.LongEventHandler:LongEventsUpdate (bool&)
Verse.Root:Update ()
Verse.Root_Entry:Update ()

Loaded file (Scenario) is from version 1.5.4063 rev1072, we are running version 1.5.4066 rev841.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
Verse.ScribeMetaHeaderUtility:LoadGameDataHeader (Verse.ScribeMetaHeaderUtility/ScribeHeaderMode,bool)
Verse.GameDataSaveLoader:TryLoadScenario (string,RimWorld.ScenarioCategory,RimWorld.Scenario&)
RimWorld.ScenarioFiles:RecacheData ()
RimWorld.ScenarioLister:RecacheData ()
RimWorld.ScenarioLister:RecacheIfDirty ()
RimWorld.ScenarioLister/<ScenariosInCategory>d__2:MoveNext ()
System.Linq.Enumerable:TryGetFirst<RimWorld.Scenario> (System.Collections.Generic.IEnumerable`1<RimWorld.Scenario>,bool&)
System.Linq.Enumerable:FirstOrDefault<RimWorld.Scenario> (System.Collections.Generic.IEnumerable`1<RimWorld.Scenario>)
RimWorld.Page_SelectScenario:EnsureValidSelection ()
RimWorld.Page_SelectScenario:PreOpen ()
Verse.WindowStack:Add (Verse.Window)
RimWorld.MainMenuDrawer/<>c:<DoMainMenuControls>b__24_8 ()
Verse.ListableOption:DrawOption (UnityEngine.Vector2,single)
Verse.OptionListingUtility:DrawOptionListing (UnityEngine.Rect,System.Collections.Generic.List`1<Verse.ListableOption>)
RimWorld.MainMenuDrawer:DoMainMenuControls (UnityEngine.Rect,bool)
RimWorld.MainMenuDrawer:MainMenuOnGUI ()
Verse.UIRoot_Entry:DoMainMenu ()
Verse.UIRoot_Entry:UIRootOnGUI ()
Verse.Root:OnGUI ()

Loaded file (Scenario) is from version 1.4.3901 rev238, we are running version 1.5.4066 rev841.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
Verse.ScribeMetaHeaderUtility:LoadGameDataHeader (Verse.ScribeMetaHeaderUtility/ScribeHeaderMode,bool)
Verse.GameDataSaveLoader:TryLoadScenario (string,RimWorld.ScenarioCategory,RimWorld.Scenario&)
RimWorld.ScenarioFiles:RecacheData ()
RimWorld.ScenarioLister:RecacheData ()
RimWorld.ScenarioLister:RecacheIfDirty ()
RimWorld.ScenarioLister/<ScenariosInCategory>d__2:MoveNext ()
System.Linq.Enumerable:TryGetFirst<RimWorld.Scenario> (System.Collections.Generic.IEnumerable`1<RimWorld.Scenario>,bool&)
System.Linq.Enumerable:FirstOrDefault<RimWorld.Scenario> (System.Collections.Generic.IEnumerable`1<RimWorld.Scenario>)
RimWorld.Page_SelectScenario:EnsureValidSelection ()
RimWorld.Page_SelectScenario:PreOpen ()
Verse.WindowStack:Add (Verse.Window)
RimWorld.MainMenuDrawer/<>c:<DoMainMenuControls>b__24_8 ()
Verse.ListableOption:DrawOption (UnityEngine.Vector2,single)
Verse.OptionListingUtility:DrawOptionListing (UnityEngine.Rect,System.Collections.Generic.List`1<Verse.ListableOption>)
RimWorld.MainMenuDrawer:DoMainMenuControls (UnityEngine.Rect,bool)
RimWorld.MainMenuDrawer:MainMenuOnGUI ()
Verse.UIRoot_Entry:DoMainMenu ()
Verse.UIRoot_Entry:UIRootOnGUI ()
Verse.Root:OnGUI ()

Initializing new game with mods:
- brrainz.harmony
- Ludeon.RimWorld
- Ludeon.RimWorld.Royalty
- Ludeon.RimWorld.Ideology
- Ludeon.RimWorld.Biotech
- Ludeon.RimWorld.Anomaly
- OskarPotocki.VanillaFactionsExpanded.Core
- VanillaExpanded.VFEA
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.InitNewGame_Patch0 (Verse.Game)
Verse.Root_Play/<>c:<Start>b__1_2 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

Can't enable CompPowerTrader(parent=VFEA_Turret_AncientPointDefense12072 at=(121, 0, 79))
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:TryTurnOnImmediately (RimWorld.CompPowerTrader,Verse.Map)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:EnsurePowerUsersConnected (Verse.Map)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:PostMapGenerate (Verse.Map)
RimWorld.Scenario:PostMapGenerate (Verse.Map)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.MapGenerator.GenerateMap_Patch1 (Verse.IntVec3,RimWorld.Planet.MapParent,Verse.MapGeneratorDef,System.Collections.Generic.IEnumerable`1<Verse.GenStepWithParams>,System.Action`1<Verse.Map>,bool)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.InitNewGame_Patch0 (Verse.Game)
Verse.Root_Play/<>c:<Start>b__1_2 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

Can't enable CompPowerTrader(parent=VFEA_AncientHeater12610 at=(96, 0, 99))
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Message (string)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:TryTurnOnImmediately (RimWorld.CompPowerTrader,Verse.Map)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:EnsurePowerUsersConnected (Verse.Map)
VFEAncients.ScenPart_ReconnectAllPowerBuildings:PostMapGenerate (Verse.Map)
RimWorld.Scenario:PostMapGenerate (Verse.Map)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.MapGenerator.GenerateMap_Patch1 (Verse.IntVec3,RimWorld.Planet.MapParent,Verse.MapGeneratorDef,System.Collections.Generic.IEnumerable`1<Verse.GenStepWithParams>,System.Action`1<Verse.Map>,bool)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.InitNewGame_Patch0 (Verse.Game)
Verse.Root_Play/<>c:<Start>b__1_2 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__28_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

Could not resolve site parts.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.QuestGen.QuestNode_GetSitePartDefsByTagsAndFaction:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestGen.QuestNode_Sequence:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.QuestGen.QuestGen.Generate_Patch1 (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
RimWorld.QuestUtility:GenerateQuestAndMakeAvailable (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
VFEAncients.CompQuestOnHacked:ReceiveCompSignal (string)
Verse.ThingWithComps:BroadcastCompSignal (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.CompHackable.Hack_Patch1 (RimWorld.CompHackable,single,Verse.Pawn)
RimWorld.CompHackable:<CompGetGizmosExtra>b__22_1 ()
Verse.Command_Action:ProcessInput (UnityEngine.Event)
Verse.GizmoGridDrawer:DrawGizmoGrid (System.Collections.Generic.IEnumerable`1<Verse.Gizmo>,single,Verse.Gizmo&,System.Func`2<Verse.Gizmo, bool>,System.Func`2<Verse.Gizmo, bool>,System.Func`2<Verse.Gizmo, bool>,bool)
RimWorld.InspectGizmoGrid:DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1<object>,Verse.Gizmo&)
RimWorld.MainTabWindow_Inspect:DrawInspectGizmos ()
RimWorld.InspectPaneUtility:ExtraOnGUI (RimWorld.IInspectPane)
RimWorld.MainTabWindow_Inspect:ExtraOnGUI ()
Verse.WindowStack:WindowStackOnGUI ()
RimWorld.UIRoot_Play:UIRootOnGUI ()
Verse.Root:OnGUI ()

Exception running QuestNode_GenerateSite: System.NullReferenceException: Object reference not set to an instance of an object
[Ref D7DD3D1A]
at RimWorld.QuestGen.QuestGen_Sites.GenerateSite (System.Collections.Generic.IEnumerable`1[T] sitePartsParams, System.Int32 tile, RimWorld.Faction faction, System.Boolean hiddenSitePartsPossible, Verse.Grammar.RulePack singleSitePartRules) [0x00008] in <f40318a15dd2424e8ab139f74270c36f>:0
at RimWorld.QuestGen.QuestNode_GenerateSite.RunInt () [0x00042] in <f40318a15dd2424e8ab139f74270c36f>:0
at RimWorld.QuestGen.QuestNode.Run () [0x00015] in <f40318a15dd2424e8ab139f74270c36f>:0

Slate vars:
askerIsNull=true
enemyFaction=Ancient soldiers
hiddenSitePartsPossible=true
inSignal=Quest0.Initiate
map=Map-0-PlayerHome
points=35
rewardValue=550
sitePartsParams=null
siteTile=9415
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
RimWorld.QuestGen.QuestNode_SubScript:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestGen.QuestNode_Sequence:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.QuestGen.QuestGen.Generate_Patch1 (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
RimWorld.QuestUtility:GenerateQuestAndMakeAvailable (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
VFEAncients.CompQuestOnHacked:ReceiveCompSignal (string)
Verse.ThingWithComps:BroadcastCompSignal (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.CompHackable.Hack_Patch1 (RimWorld.CompHackable,single,Verse.Pawn)
RimWorld.CompHackable:<CompGetGizmosExtra>b__22_1 ()
Verse.Command_Action:ProcessInput (UnityEngine.Event)
Verse.GizmoGridDrawer:DrawGizmoGrid (System.Collections.Generic.IEnumerable`1<Verse.Gizmo>,single,Verse.Gizmo&,System.Func`2<Verse.Gizmo, bool>,System.Func`2<Verse.Gizmo, bool>,System.Func`2<Verse.Gizmo, bool>,bool)
RimWorld.InspectGizmoGrid:DrawInspectGizmoGridFor (System.Collections.Generic.IEnumerable`1<object>,Verse.Gizmo&)
RimWorld.MainTabWindow_Inspect:DrawInspectGizmos ()
RimWorld.InspectPaneUtility:ExtraOnGUI (RimWorld.IInspectPane)
RimWorld.MainTabWindow_Inspect:ExtraOnGUI ()
Verse.WindowStack:WindowStackOnGUI ()
RimWorld.UIRoot_Play:UIRootOnGUI ()
Verse.Root:OnGUI ()

Same exact problem here.

Same Problem For me, i use the broadcast station in the starting vault quest pop up comes and go finish without a new vault.

Exception running QuestNode_GenerateSite: System.NullReferenceException: Object reference not set to an instance of an object
[Ref D7DD3D1A]
at RimWorld.QuestGen.QuestGen_Sites.GenerateSite (System.Collections.Generic.IEnumerable`1[T] sitePartsParams, System.Int32 tile, RimWorld.Faction faction, System.Boolean hiddenSitePartsPossible, Verse.Grammar.RulePack singleSitePartRules) [0x00008] in <f40318a15dd2424e8ab139f74270c36f>:0
at RimWorld.QuestGen.QuestNode_GenerateSite.RunInt () [0x00042] in <f40318a15dd2424e8ab139f74270c36f>:0
at RimWorld.QuestGen.QuestNode.Run () [0x00015] in <f40318a15dd2424e8ab139f74270c36f>:0

Slate vars:
askerIsNull=true
enemyFaction=Ancient soldiers
hiddenSitePartsPossible=true
inSignal=Quest0.Initiate
map=Map-0-PlayerHome
points=35
rewardValue=550
sitePartsParams=null
siteTile=36076
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
RimWorld.QuestGen.QuestNode_SubScript:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestGen.QuestNode_Sequence:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.QuestGen.QuestGen.Generate_Patch1 (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
RimWorld.QuestUtility:GenerateQuestAndMakeAvailable (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
VFEAncients.CompQuestOnHacked:ReceiveCompSignal (string)
VaultsAreEternal.CompQuestOnHackedDetonate:ReceiveCompSignal (string)
Verse.ThingWithComps:BroadcastCompSignal (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.CompHackable.Hack_Patch1 (RimWorld.CompHackable,single,Verse.Pawn)
RimWorld.JobDriver_Hack:<MakeNewToils>b__5_0 ()
Verse.AI.JobDriver:DriverTick ()
Verse.AI.Pawn_JobTracker:JobTrackerTick ()
Verse.Pawn:Tick ()
Verse.TickList:Tick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch2 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
Verse.Game:UpdatePlay ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)

And this one.

Could not resolve site parts.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch1 (string)
RimWorld.QuestGen.QuestNode_GetSitePartDefsByTagsAndFaction:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestGen.QuestNode_Sequence:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.QuestGen.QuestGen.Generate_Patch1 (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
RimWorld.QuestUtility:GenerateQuestAndMakeAvailable (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
VFEAncients.CompQuestOnHacked:ReceiveCompSignal (string)
VaultsAreEternal.CompQuestOnHackedDetonate:ReceiveCompSignal (string)
Verse.ThingWithComps:BroadcastCompSignal (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.CompHackable.Hack_Patch1 (RimWorld.CompHackable,single,Verse.Pawn)
RimWorld.JobDriver_Hack:<MakeNewToils>b__5_0 ()
Verse.AI.JobDriver:DriverTick ()
Verse.AI.Pawn_JobTracker:JobTrackerTick ()
Verse.Pawn:Tick ()
Verse.TickList:Tick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch2 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
Verse.Game:UpdatePlay ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)

And this one is the Debug from Quest

-----------------
Id: 0
State: EndedUnknownOutcome
Data:
<saveable Class="Quest">
<name>Adventure to the Ancient vault</name>
<appearanceTick>12036</appearanceTick>
<acceptanceTick>12036</acceptanceTick>
<acceptedBy>null</acceptedBy>
<ended>True</ended>
<cleanedUp>True</cleanedUp>
<cleanupTick>12036</cleanupTick>
<initiallyAccepted>True</initiallyAccepted>
<challengeRating>1</challengeRating>
<description>We've intercepted messages about a sealed vault not far from &lt;color=#00BCD8FF&gt;Kolonie&lt;/color&gt;. The site is full of ancient technology and relics.

It seems that it is still defended by ancient soldiers.</description>
<root>VFEA_OpportunitySite_SealedVault</root>
<signalsReceivedDebug IsNull="True" />
<parts>
<li Class="QuestPart_QuestEnd">
<inSignal>Quest0.OuterNodeCompleted</inSignal>
<outcome>Unknown</outcome>
</li>
<li Class="QuestPart_NoWorldObject">
<inSignalEnable>Quest0.Initiate</inSignalEnable>
<outSignalsCompleted>
<li>Quest0.OuterNodeCompleted</li>
</outSignalsCompleted>
<state>Disabled</state>
<enableTick>12036</enableTick>
<worldObject>null</worldObject>
</li>
</parts>
<tags />
<parent>null</parent>
</saveable>

Active QuestParts:
None

Adding my non-working issue to the pile. Could not resolve site parts for me as well.

Could not resolve site parts.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch2 (string)
RimWorld.QuestGen.QuestNode_GetSitePartDefsByTagsAndFaction:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestGen.QuestNode_Sequence:RunInt ()
RimWorld.QuestGen.QuestNode:Run ()
RimWorld.QuestScriptDef:Run ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.QuestGen.QuestGen.Generate_Patch1 (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
RimWorld.QuestUtility:GenerateQuestAndMakeAvailable (RimWorld.QuestScriptDef,RimWorld.QuestGen.Slate)
VFEAncients.CompQuestOnHacked:ReceiveCompSignal (string)
Verse.ThingWithComps:BroadcastCompSignal (string)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:RimWorld.CompHackable.Hack_Patch1 (RimWorld.CompHackable,single,Verse.Pawn)
RimWorld.JobDriver_Hack:<MakeNewToils>b__5_0 ()
Verse.AI.JobDriver:DriverTick ()
Verse.AI.Pawn_JobTracker:JobTrackerTick ()
Verse.Pawn:Tick ()
Verse.TickList:Tick ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.TickManager.DoSingleTick_Patch2 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Game.UpdatePlay_Patch2 (Verse.Game)
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)

Yep me too

I had the same issue and had to use dev mode to create a site. When I did this I discovered the solution to the issue Dracon found because vault sites have 2 spawning parts VFEA_SealedVault and VFEA_AncientSoldierHostile (they are not hostile if playing as a new vault).

-----------------
Id: 31
State: EndedUnknownOutcome
Data:
<saveable Class="Quest">
<id>31</id>
<name>Treasure Hunt to the Secured Vault</name>
<appearanceTick>3098391</appearanceTick>
<acceptanceTick>3098391</acceptanceTick>
<acceptedBy>null</acceptedBy>
<ended>True</ended>
<cleanedUp>True</cleanedUp>
<cleanupTick>3098391</cleanupTick>
<initiallyAccepted>True</initiallyAccepted>
<challengeRating>1</challengeRating>
<description>We've intercepted messages about a sealed vault not far from &lt;color=#00BCD8FF&gt;Armstone&lt;/color&gt;. The site is full of ancient technology and relics.

It seems that it is still defended by ancient soldiers.</description>
<root>VFEA_OpportunitySite_SealedVault</root>
<signalsReceivedDebug IsNull="True" />
<parts>
<li Class="QuestPart_Letter">
<inSignal>Quest31.OuterNodeCompleted</inSignal>
<letter Class="StandardLetter">
<ID>477</ID>
<def>NeutralEvent</def>
<label>Quest expired: Treasure Hunt to the Secured Vault</label>
<lookTargets IsNull="True" />
<relatedFaction>null</relatedFaction>
<text>Intercepted communications indicate the sealed vault has been opened and scavenged by others. The quest Treasure Hunt to the Secured Vault has expired.</text>
<quest>Quest_31</quest>
<hyperlinkThingDefs IsNull="True" />
<hyperlinkHediffDefs IsNull="True" />
</letter>
<useColonistsOnMap>null</useColonistsOnMap>
<colonistsFromSignal />
<visitors IsNull="True" />
</li>
<li Class="QuestPart_QuestEnd">
<inSignal>Quest31.OuterNodeCompleted</inSignal>
<outcome>Fail</outcome>
</li>
<li Class="QuestPart_WorldObjectTimeout">
<inSignalEnable>Quest31.Initiate</inSignalEnable>
<inSignalDisable>Quest31.site.MapGenerated</inSignalDisable>
<outSignalsCompleted>
<li>Quest31.OuterNodeCompleted</li>
</outSignalsCompleted>
<state>Enabled</state>
<enableTick>3098391</enableTick>
<delayTicks>1080000</delayTicks>
<expiryInfoPart>Expires in {0}</expiryInfoPart>
<expiryInfoPartTip>Expires on {0}</expiryInfoPartTip>
<inspectStringTargets IsNull="True" />
<isBad>True</isBad>
<alertCulprits />
<worldObject>null</worldObject>
</li>
<li Class="QuestPart_QuestEnd">
<inSignal>Quest31.OuterNodeCompleted2</inSignal>
<outcome>Unknown</outcome>
</li>
<li Class="QuestPart_NoWorldObject">
<inSignalEnable>Quest31.Initiate</inSignalEnable>
<outSignalsCompleted>
<li>Quest31.OuterNodeCompleted2</li>
</outSignalsCompleted>
<state>Disabled</state>
<enableTick>3098391</enableTick>
<worldObject>null</worldObject>
</li>
</parts>
<tags />
<parent>null</parent>
</saveable>

Active QuestParts:
QuestPart_WorldObjectTimeout (quest.id=31, index=2)