The reading policy no longer exists as a class and the game cannot create maps anymore.
Log file:
Exception from asynchronous event: System.NullReferenceException: Object reference not set to an instance of an object
[Ref F972DEFC]
at Verse.GenTypes.SameOrSubclassOf (System.Type baseType, System.Type parentType) [0x00009] in <cb53cd4422904947932d33f561ad8d15>:0
at Verse.GenTypes.SameOrSubclassOf[T] (System.Type baseType) [0x00000] in <cb53cd4422904947932d33f561ad8d15>:0
at RimWorld.ReadingPolicyDatabase.GenerateStartingPolicies () [0x0003e] in <cb53cd4422904947932d33f561ad8d15>:0
RimWorld.ReadingPolicyDatabase..ctor()
Verse.Game..ctor()
at HugsLib.Quickstart.QuickstartController.ApplyQuickstartConfiguration () [0x00008] in <e92fb9c535b84355b807623efc376846>:0
at HugsLib.Quickstart.QuickstartController+<>c.<InitiateMapGeneration>b__7_0 () [0x00007] in <e92fb9c535b84355b807623efc376846>:0
at Verse.LongEventHandler.RunEventFromAnotherThread (System.Action action) [0x00008] in <cb53cd4422904947932d33f561ad8d15>:0
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch3 (string)
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 ()