今天突然发现人操的机枪碉堡们全部没有子弹显示（正常的炮塔点一下会出现弹药显示），且操作员进炮塔后无法开火，且日志里飙满了如下红字：
Exception drawing FTC_Wall_Howitzer9123263: System.InvalidCastException: Specified cast is not valid.
at RimWorld.Building_TurretGun.Draw () [0x0002a] in <cd7169108ea74757aa50c5b33d275c15>:0
at (wrapper dynamic-method) Verse.DynamicDrawManager.Verse.DynamicDrawManager.DrawDynamicThings_Patch1(Verse.DynamicDrawManager)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch2 (string)
(wrapper dynamic-method) Verse.DynamicDrawManager:Verse.DynamicDrawManager.DrawDynamicThings_Patch1 (Verse.DynamicDrawManager)
(wrapper dynamic-method) Verse.Map:Verse.Map.MapUpdate_Patch1 (Verse.Map)
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch3 (Verse.Game)
(wrapper dynamic-method) Verse.Root_Play:Verse.Root_Play.Update_Patch1 (Verse.Root_Play)


不知道是否和这个bug有关。希望大佬能帮忙解决！