Two errors are generated when using the mod. I know the second one is due to a recent game update. The original Optimization: Meat is also getting the same error.

[Optimization: Meat and Leather] Patch operation Verse.PatchOperationSequence(count=8, lastFailedOperation=Verse.PatchOperationReplace(Defs/AlienRace.ThingDef_AlienRace/race[contains(thinkTreeMain, "Humanlike")]/useMeatFrom)) failed
file: D:\SteamLibrary\steamapps\workshop\content\294100\2227806226\Patches\SimplifyMeatAndLeather.xml
Verse.Log:Error(String, Boolean)
Verse.PatchOperation:Complete(String)
Verse.PatchOperationSequence:Complete(String)
Verse.LoadedModManager:ClearCachedPatches()
Verse.LoadedModManager:LoadAllActiveMods()
Verse.PlayDataLoader:DoPlayLoad()
Verse.PlayDataLoader:LoadAllPlayData(Boolean)
Verse.<>c:<Start>b__6_1()
Verse.LongEventHandler:RunEventFromAnotherThread(Action)
Verse.<>c:<UpdateCurrentAsynchronousEvent>b__27_0()
System.Threading.ThreadHelper:ThreadStart_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object)
System.Threading.ThreadHelper:ThreadStart()

and

Could not resolve cross-reference: No Verse.ThingDef named Meat_Muffalo found to give to Verse.RecipeDef ButcherCorpseFlesh
Verse.Log:Error(String, Boolean)
Verse.WantedRefForObject:TryResolve(FailMode)
Verse.<>c__DisplayClass15_1:<ResolveAllWantedCrossReferences>b__0(WantedRef)
Verse.<>c__DisplayClass6_1`1:<ParallelForEach>b__0(Object)
System.Threading.QueueUserWorkItemCallback:WaitCallback_Context(Object)
System.Threading.ExecutionContext:RunInternal(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.ExecutionContext:Run(ExecutionContext, ContextCallback, Object, Boolean)
System.Threading.QueueUserWorkItemCallback:System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
System.Threading.ThreadPoolWorkQueue:Dispatch()
System.Threading._ThreadPoolWaitCallback:PerformWaitCallback()