After import assets in logs appear next message:
LogOutputDevice: Error: === Handled ensure: ===
LogOutputDevice: Error: Ensure condition failed: PSOPrimitiveType == PT_Num || (EPrimitiveType)PrimitiveType == PSOPrimitiveType [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Commands.cpp] [Line: 1283]
LogOutputDevice: Error: PSO was created using PrimitiveType 0, but the Draw call is using 1! This will break D3D12, Metal and Vulkan
LogOutputDevice: Error: Stack:
LogOutputDevice: Error: [Callstack] 0x00007ff969a4e126 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff969768a54 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff96977a9b2 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9528fb099 UE4Editor-D3D11RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff979c5e189 UE4Editor-RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff979c637c5 UE4Editor-RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff979c63355 UE4Editor-RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff979c6447c UE4Editor-RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff979c5c3ed UE4Editor-RHI.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff95592377f UE4Editor-Renderer.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff95541274e UE4Editor-Renderer.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9559249a2 UE4Editor-Renderer.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9558f20b2 UE4Editor-Renderer.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9695f1758 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9695f1c16 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff989129af9 UE4Editor-RenderCore.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff98912aa74 UE4Editor-RenderCore.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff969a4c440 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff969a3ca41 UE4Editor-Core.dll!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9a0243034 KERNEL32.DLL!UnknownFunction []
LogOutputDevice: Error: [Callstack] 0x00007ff9a1081461 ntdll.dll!UnknownFunction []
LogStats: FDebug::EnsureFailed - 0.002 s
Which repeated many times.
And every time the memory consumption increases.
This error is not present in version 4.20