Probably has to do with the new world tile "levels" - including space. Event seems to appear on the map ok (haven't visited yet) but error ocurrs. With debug print:

[RealRuins][QuestNode_FindBlueprintNode]: TestRun launched
[RealRuins][QuestNode_GenerateRuinsNode]: TestRun Launched

Could not convert SlateRef "$worldTile" (PlanetTile) to Int32

UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition:Verse.Log.Error_Patch3 (string)
RimWorld.QuestGen.SlateRef`1<int>:TryGetConvertedValue<int> (RimWorld.QuestGen.Slate,int&)
RimWorld.QuestGen.SlateRef`1<int>:TryGetValue (RimWorld.QuestGen.Slate,int&)
RimWorld.QuestGen.SlateRef`1<int>:GetValue (RimWorld.QuestGen.Slate)
RealRuins.QuestNode_GenerateRuinsObject:TestRunInt (RimWorld.QuestGen.Slate)
(wrapper dynamic-method)

[RealRuins][Event]: Starting incident worker for ruins major event

..continues as normal