I’ve had this since 4.20 as well. In addition it causes an error when cooking content:
UATHelper: Cooking (Windows): LogWindows: Error: begin: stack for UAT
UATHelper: Cooking (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: Fatal error: [File:C:\Unreal Engine\UnrealEngine\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 305]
UATHelper: Cooking (Windows): LogWindows: Error: Illegal call to StaticFindObject() while serializing object data!
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd5b0aa388 KERNELBASE.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd2e3770ca UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [c:\unreal engine\unrealengine\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:63]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd2e15a4e7 UE4Editor-Core.dll!FOutputDevice::LogfImpl() [c:\unreal engine\unrealengine\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
PackagingResults: Error: begin: stack for UAT
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd2e093147 UE4Editor-Core.dll!FDebug::AssertFailed() [c:\unreal engine\unrealengine\engine\source\runtime\core\private\misc\assertionmacros.cpp:417]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd2ec9cf81 UE4Editor-CoreUObject.dll!StaticFindObject() [c:\unreal engine\unrealengine\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:308]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf3ef20 UE4Editor-NiagaraShader.dll!FNiagaraDataInterfaceParamRef::InitDIClass() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashader.cpp:1338]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf2ed11 UE4Editor-NiagaraShader.dll!operator<<() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashader.cpp:1369]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf2ec10 UE4Editor-NiagaraShader.dll!operator<<() [c:\unreal engine\unrealengine\engine\source\runtime\core\public\containers\array.h:1100]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf50179 UE4Editor-NiagaraShader.dll!FNiagaraShader::Serialize() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashader.cpp:1284]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd33233d67 UE4Editor-ShaderCore.dll!FShader::SerializeBase() [c:\unreal engine\unrealengine\engine\source\runtime\shadercore\private\shader.cpp:1015]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf50e25 UE4Editor-NiagaraShader.dll!TShaderMap<FNiagaraShaderType>::SerializeInline() [c:\unreal engine\unrealengine\engine\source\runtime\shadercore\public\shader.h:1892]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf503f4 UE4Editor-NiagaraShader.dll!FNiagaraShaderMap::Serialize() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashader.cpp:1103]
PackagingResults: Error: === Critical error: ===
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf3f8b0 UE4Editor-NiagaraShader.dll!FNiagaraShaderMap::LoadFromDerivedDataCache() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashader.cpp:466]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf364c6 UE4Editor-NiagaraShader.dll!FNiagaraShaderScript::CacheShaders() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashared.cpp:275]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcfbf36c94 UE4Editor-NiagaraShader.dll!FNiagaraShaderScript::CacheShaders() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagarashader\private\niagarashared.cpp:257]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcf4e13710 UE4Editor-Niagara.dll!UNiagaraScript::CacheShadersForResources() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagara\private\niagarascript.cpp:993]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcf4e1333d UE4Editor-Niagara.dll!UNiagaraScript::CacheResourceShadersForCooking() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagara\private\niagarascript.cpp:975]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffcf4e10ed3 UE4Editor-Niagara.dll!UNiagaraScript::BeginCacheForCookedPlatformData() [c:\unreal engine\unrealengine\engine\plugins\fx\niagara\source\niagara\private\niagarascript.cpp:943]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd2ec1558f UE4Editor-CoreUObject.dll!UPackage::Save() [c:\unreal engine\unrealengine\engine\source\runtime\coreuobject\private\uobject\savepackage.cpp:3848]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08f20387 UE4Editor-UnrealEd.dll!UEditorEngine::Save() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\editorengine.cpp:4441]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08dc2b3b UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\cookontheflyserver.cpp:3988]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08dc5361 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackages() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2896]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08dd0612 UE4Editor-UnrealEd.dll!UCookOnTheFlyServer::TickCookOnTheSide() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\cookontheflyserver.cpp:2372]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08c33e1b UE4Editor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:882]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd08c65edf UE4Editor-UnrealEd.dll!UCookCommandlet::Main() [c:\unreal engine\unrealengine\engine\source\editor\unrealed\private\commandlets\cookcommandlet.cpp:586]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff73bbedf15 UE4Editor-Cmd.exe!FEngineLoop::PreInit() [c:\unreal engine\unrealengine\engine\source\runtime\launch\private\launchengineloop.cpp:2478]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff73bbe4ae2 UE4Editor-Cmd.exe!GuardedMain() [c:\unreal engine\unrealengine\engine\source\runtime\launch\private\launch.cpp:135]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff73bbe4d2a UE4Editor-Cmd.exe!GuardedMainWrapper() [c:\unreal engine\unrealengine\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff73bbf3aaa UE4Editor-Cmd.exe!WinMain() [c:\unreal engine\unrealengine\engine\source\runtime\launch\private\windows\launchwindows.cpp:276]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ff73bbf4a16 UE4Editor-Cmd.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd5d453034 KERNEL32.DLL!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error: [Callstack] 0x00007ffd5e081471 ntdll.dll!UnknownFunction []
UATHelper: Cooking (Windows): LogWindows: Error:
UATHelper: Cooking (Windows): LogWindows: Error: end: stack for UAT