I'm getting another error that might be related to the one I posted earlier (in a discussion thread that was deleted after you made a note of it: recurring workgiver error). It's a different error, but only happening to bots, so I'm posting it in case it's helpful in narrowing anything down:
Called MaterialsNeeded on a Blueprint_Install.
Verse.Log:Error(String, Boolean)
RimWorld.Blueprint_Install:MaterialsNeeded()
HMTBLite.HarmonyPatches:Patch_Postfix_WorkGivers_Job(WorkGiver_ConstructDeliverResources, Thing, Job&)
RimWorld.WorkGiver_ConstructDeliverResourcesToBlueprints:JobOnThing_Patch3(Object, Pawn, Thing, Boolean)
RimWorld.WorkGiver_Scanner:HasJobOnThing(Pawn, Thing, Boolean)
AIRobot.<>c__DisplayClass1_0:<TryIssueJobPackage>b__0(Thing)
Verse.<ClosestThingReachable>c__AnonStorey0:<>m__0(Thing)
Verse.GenClosest:ClosestThing_Global(IntVec3, IEnumerable, Single, Predicate`1, Func`2)
Verse.GenClosest:ClosestThingReachable(IntVec3, Map, ThingRequest, PathEndMode, TraverseParms, Single, Predicate`1, IEnumerable`1, Int32, Int32, Boolean, RegionType, Boolean)
AIRobot.X2_JobGiver_Work:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_PrioritySorter:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.ThinkNode_Priority:TryIssueJobPackage(Pawn, JobIssueParams)
Verse.AI.Pawn_JobTracker:DetermineNextJob_Patch1(Object, ThinkTreeDef&)
Verse.AI.Pawn_JobTracker:TryFindAndStartJob()
Verse.AI.Pawn_JobTracker:EndCurrentJob_Patch1(Object, JobCondition, Boolean)
Verse.AI.JobDriver:EndJobWith(JobCondition)
Verse.AI.JobDriver:CheckCurrentToilEndOrFail()
Verse.AI.JobDriver:DriverTick_Patch1(Object)
Verse.AI.Pawn_JobTracker:JobTrackerTick()
Verse.Pawn:Tick_Patch2(Object)
AIRobot.X2_AIRobot:Tick()
Verse.TickList:Tick_Patch2(Object)
Verse.TickManager:DoSingleTick()
Verse.TickManager:TickManagerUpdate()
Verse.Game:UpdatePlay_Patch2(Object)
Verse.Root_Play:Update()