I couldn’t find any similar problems on the internet. I see this error when I try to collapse layers of landscape.
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Assertion failed: WeightData.Num() == MipSizeSquare [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Landscape/Private/LandscapeEditInterface.cpp] [Line: 4457] UE4Editor_Core UE4Editor_Core UE4Editor_Landscape UE4Editor_Landscape UE4Editor_Landscape UE4Editor_Landscape UE4Editor_Landscape UE4Editor_Landscape UE4Editor_LandscapeEditor UE4Editor_LandscapeEditor UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_Slate UE4Editor_ApplicationCore UE4Editor_ApplicationCore UE4Editor_ApplicationCore UE4Editor_ApplicationCore user32 user32 UE4Editor_ApplicationCore UE4Editor UE4Editor UE4Editor UE4Editor UE4Editor UE4Editor kernel32 ntdll
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[17:23]