Seems there's an error causing shuttles or drop pods with people inside specifically to disappear upon touching the ground. Snipped a bit of the error bellow. They fly in, touch the ground, then just evaporate lol None were touching ice either oddly enough.

Exception ticking ShuttleIncoming2882238 (at (190, 0, 141)): System.NullReferenceException: Object reference not set to an instance of an object
at Ice.Patches.PlaceSpotQualityAt_Patch.Postfix (Verse.GenPlace+PlaceSpotQuality& __result, Verse.IntVec3 c, Verse.Rot4 rot, Verse.Map map, Verse.Thing thing, Verse.IntVec3 center, System.Boolean allowStacking, System.Predicate`1[T] extraValidator) [0x0001e] in <c63699d5023a484aaaa20617bbdda124>:0
at (wrapper dynamic-method) Verse.GenPlace.Verse.GenPlace.PlaceSpotQualityAt_Patch1(Verse.IntVec3,Verse.Rot4,Verse.Map,Verse.Thing,Verse.IntVec3,bool,System.Predicate`1<Verse.IntVec3>)
at Verse.GenPlace.TryFindPlaceSpotNear (Verse.IntVec3 center, Verse.Rot4 rot, Verse.Map map, Verse.Thing thing, System.Boolean allowStacking, Verse.IntVec3& bestSpot, System.Predicate`1[T] extraValidator) [0x00020] in <d243303f714d4dc48680ccaecd2f594e>:0
at Verse.GenPlace.TryPlaceThing (Verse.Thing thing, Verse.IntVec3 center, Verse.Map map, Verse.ThingPlaceMode mode, Verse.Thing& lastResultingThing, System.Action`2[T1,T2] placedAction, System.Predicate`1[T] nearPlaceValidator, Verse.Rot4 rot) [0x00055] in <d243303f714d4dc48680ccaecd2f594e>:0
at Verse.GenPlace.TryPlaceThing (Verse.Thing thing, Verse.IntVec3 center, Verse.Map map, Verse.ThingPlaceMode mode, System.Action`2[T1,T2] placedAction, System.Predicate`1[T] nearPlaceValidator, Verse.Rot4 rot) [0x00000] in <d243303f714d4dc48680ccaecd2f594e>:0
at RimWorld.Skyfaller.SpawnThings () [0x00042] in <d243303f714d4dc48680ccaecd2f594e>:0
at RimWorld.Skyfaller.Impact () [0x000ba] in <d243303f714d4dc48680ccaecd2f594e>:0
at (wrapper dynamic-method) RimWorld.Skyfaller.RimWorld.Skyfaller.Tick_Patch2(RimWorld.Skyfaller)
at Verse.TickList.Tick () [0x0015c] in <d243303f714d4dc48680ccaecd2f594e>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch2 (string)
Verse.TickList:Tick ()
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch6 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch4 (Verse.Game)
Verse.Root_Play:Update ()
ticksToImpact < 0. Was there an exception? Destroying skyfaller.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch2 (string)
(wrapper dynamic-method) RimWorld.Skyfaller:RimWorld.Skyfaller.Tick_Patch2 (RimWorld.Skyfaller)
Verse.TickList:Tick ()
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch6 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch4 (Verse.Game)
Verse.Root_Play:Update ()