Crash on startup

Crashes get back again after save all properly and restart editor… When I try to open GM, or any tabs or menu where using GM, editor just crashes

P.S. Interesting moment, yesterday when I completing my work I opened Class Settings and saw this “Thumbnail” field again, but everything had work fine and I just didn’t pay attention to it. Now I roll back to previous stable commit and this one don’t have “Thumbnail” in GM Class Settings. I don’t know in which moment, but this looks like this parameter appeared and broke something

Assertion failed: !Object->HasAnyFlags(RF_NeedLoad | RF_NeedInitialization) [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading2.cpp] [Line: 10517] 
Object='GM_VehicleAdvCopy_C /Game/VehicleTemplate/Blueprints/GM_VehicleAdvCopy.Default__GM_VehicleAdvCopy_C' (0000026A0FBD7800), Flags=Public | ClassDefaultObject | ArchetypeObject | NeedLoad | WasLoaded, InternalFlags=0x04504000


UnrealEditor_Core
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
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UnrealEditor_Engine
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UnrealEditor_CoreUObject
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UnrealEditor
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UnrealEditor
kernel32
ntdll