Prolly fix to the castle siege doors target (c2)
Ok, i dont have the c2 files right now, but im assuming that they havent modified the doordata.txt, so we got a ID mismatch.
C1 client StaticObject-e.txt:
staticobject_begin id=9001 name=[Castle Door] staticobject_end
C1 Server doordata.txt:
door_begin [gludio_castle_outter_001] type=normal_type static_object_id=9001 open_method=by_npc...
C2 Client StaticObject-e.txt:
staticobject_begin id=24180018 name=[CastleDoor] staticobject_end
So u can try editing the C2 client side StaticObject-e.txt to use the old C1 ID OR try setting the server side doordata.txt ID to match the new C2 one(there also other mismatching IDs like CastleWalls), so someone can test both and post the results here.