Unreal Engine Issues and Bug Tracker (UE-175944)

Description

A crash occurs when breaking a level instance contained in a data layer. This does not occur in 5.0.3, however the behaviors of Data Layers are different in 5.1 where the Data Layer asset is added from Content Browser.

This issue is occurring in //UE5/Release-5.1 Binary CL 23058290

This issue is NOT occuring in //UE5/Release-5.0 Binary CL 20979098

Marked As Regression

Steps to Reproduce

Create a new blank project
On an open world level select Window > World Partition > Data Layers Outliner
From the Data Layers Panel right click and select "Create New Data Layer"
From the Data Layer Asset dropdown select Create New Asset > Data Layer
Select Save
Add 3 cubes to the viewport
Ctrl click the 3 cubes and right click > Level > Create Level Instance
Select Save
With the level instance selected in the viewport select the NewDataLayerAsset in the Data Layers Panel
Click the "Add selected actors to the selected data layers" button
Right click the level instance in the viewport > Level > Break > Break Level Instance
Result
Crash
Expected
Level Instance is broken and the cubes remain in the data layer

Callstack

Assertion failed: GetTypedOuter<ULevel>() == Actor->GetLevel() [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\WorldPartition\DataLayer\DataLayerInstanceWithAsset.cpp] [Line: 52]

UnrealEditor_Engine!UDataLayerInstanceWithAsset::AddActor() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\WorldPartition\DataLayer\DataLayerInstanceWithAsset.cpp:52]
UnrealEditor_Engine!<lambda_e7c0cd4e6996087d2fb6157840d7b89b>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelInstance\LevelInstanceSubsystem.cpp:1316]
UnrealEditor_Engine!UE::Core::Private::Function::TFunctionRefBase<UE::Core::Private::Function::TFunctionStorage<0>,bool __cdecl(AActor *)>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\Function.h:603]
UnrealEditor_Engine!UE::Core::Private::Function::TFunctionRefCaller<<lambda_86112f7688773e630d55b4796eabd104>,bool __cdecl(AActor *)>::Call() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\Function.h:465]
UnrealEditor_Engine!ULevelInstanceSubsystem::ForEachActorInLevel() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelInstance\LevelInstanceSubsystem.cpp:453]
UnrealEditor_Engine!ULevelInstanceSubsystem::ForEachActorInLevelInstance() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelInstance\LevelInstanceSubsystem.cpp:746]
UnrealEditor_Engine!ULevelInstanceSubsystem::BreakLevelInstance_Impl() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelInstance\LevelInstanceSubsystem.cpp:1336]
UnrealEditor_Engine!ULevelInstanceSubsystem::BreakLevelInstance() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelInstance\LevelInstanceSubsystem.cpp:1231]
UnrealEditor_LevelInstanceEditor!<lambda_6960625d4a9465591801fde224c48fd0>::operator()() [D:\build\++UE5\Sync\Engine\Source\Editor\LevelInstanceEditor\Private\LevelInstanceEditorModule.cpp:410]
UnrealEditor_LevelInstanceEditor!TBaseFunctorDelegateInstance<FReply __cdecl(void),FDefaultDelegateUserPolicy,<lambda_6960625d4a9465591801fde224c48fd0> >::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:839]
UnrealEditor_Slate!SButton::ExecuteOnClick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:465]
UnrealEditor_Slate!SButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:390]
UnrealEditor_Slate!<lambda_51e270ca99ea7ce852539efd04dd453f>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5046]
UnrealEditor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_51e270ca99ea7ce852539efd04dd453f> >() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:412]
UnrealEditor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5032]
UnrealEditor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5601]
UnrealEditor_Slate!FSlateApplication::OnMouseUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5566]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2219]
UnrealEditor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2726]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1895]
UnrealEditor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:925]
user32
user32
UnrealEditor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:142]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5291]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:202]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:107]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:244]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:282]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed

Component	UE - World Creation - Worldbuilding Tools - World Partition
Affects Versions	5.1
Target Fix	5.3

Fix Commit	23995124
Main Commit	24007132

Created	Feb 2, 2023
Resolved	Feb 3, 2023
Updated	Aug 17, 2023

UE-175944

Crash when breaking Level Instance within Data Layer Asset

Crash when breaking Level Instance within Data Layer Asset

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