和虚空异界冲突

### What happened? 发生了什么？ 只开虚空异界和本mod就可以复现 ### Relevant log output 相关的日志 ```text error calling LoadPrefabFile in mod workshop-3322803908 (云霄国度-Above the Clouds): [string "../mods/workshop-3322803908/scripts/prefabs..."]:20: attempt to call method 'GetSouth' (a nil value) LUA ERROR stack traceback: ../mods/workshop-3322803908/scripts/prefabs/house_door.lua(20,1) in function 'fn' scripts/mainfunctions.lua(163,1) =(tail call) ? =[C] in function 'xpcall' scripts/mods.lua(193,1) scripts/mods.lua(694,1) in function 'OldRegisterPrefabs' ../mods/workshop-2941527805/scripts/utils/bbgoat_utils.lua(61,1) in function 'RegisterPrefabs' scripts/gamelogic.lua(248,1) in function 'LoadAssets' scripts/gamelogic.lua(1223,1) in function 'DoResetAction' scripts/gamelogic.lua(1242,1) in function 'complete_callback' scripts/upsell.lua(13,1) in function 'UpdateGamePurchasedState' ... scripts/gamelogic.lua(1298,1) in function 'callback' scripts/playerprofile.lua(1793,1) in function 'Set' scripts/playerprofile.lua(1619,1) =[C] in function 'GetPersistentString' scripts/playerprofile.lua(1617,1) in function 'Load' scripts/gamelogic.lua(1297,1) in main chunk =[C] in function '_require' ../mods/workshop-3322803908/main/postinit.lua(237,1) in function 'require' scripts/mainfunctions.lua(1417,1) in function 'OldStart' ../mods/workshop-2941527805/scripts/utils/bbgoat_utils.lua(56,1) ```