Description

This is not a regression.

Tested in:
//UE5/Main CL18218925 Binary - Crashed
//UE5/Release-5.0 CL16682836 Binary - Crashed
//UE4/Release-4.27 CL Binary - Crashed

Having a level open that contains an Actor with an Actor Sequence Component results in a crash with memory leaks when attempting to create a level. 

I was able to get the crash every time with just an Actor with the Sequence, but user are reporting that adding a Transform Track then a Relative Transform section and keying some points increases the likely hood of a crash.

Steps to Reproduce
  1. In any project add a Cube to the scene
  2. In the Cube's details add an Actor Sequence Component
  3. Save the level
  4. Create a new basic level either using File -> Create New Level or pressing Ctrl+N

Expected Results:
A new level is created and loaded in the view port

Actual Results:
The Editor crashes with "World Memory Leaks: 2 leaks objects and packages"

Callstack
LogWindows: Windows GetLastError: The operation completed successfully. (0)
LogWindows: Error: === Critical error: ===
LogWindows: Error: 
LogWindows: Error: Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp] [Line: 2040] 
LogWindows: Error: World Memory Leaks: 2 leaks objects and packages. See The output above.
LogWindows: Error: 
LogWindows: Error: 
LogWindows: Error: 
LogWindows: Error: 
LogWindows: Error: [Callstack] 0x00007ffa2a1cb37d UnrealEditor-UnrealEd.dll!UEditorEngine::CheckForWorldGCLeaks() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:2042]
LogWindows: Error: [Callstack] 0x00007ffa2a1d3e14 UnrealEditor-UnrealEd.dll!UEditorEngine::EditorDestroyWorld() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:2175]
LogWindows: Error: [Callstack] 0x00007ffa2a1ff36d UnrealEditor-UnrealEd.dll!UEditorEngine::Map_Load() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:2571]
LogWindows: Error: [Callstack] 0x00007ffa2a1eeeef UnrealEditor-UnrealEd.dll!UEditorEngine::HandleMapCommand() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:6239]
LogWindows: Error: [Callstack] 0x00007ffa2a1d5800 UnrealEditor-UnrealEd.dll!UEditorEngine::Exec() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:5729]
LogWindows: Error: [Callstack] 0x00007ffa2ab5c4c8 UnrealEditor-UnrealEd.dll!UUnrealEdEngine::Exec() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdSrv.cpp:659]
LogWindows: Error: [Callstack] 0x00007ffa2a56c5a3 UnrealEditor-UnrealEd.dll!FEditorFileUtils::LoadMap() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:2752]
LogWindows: Error: [Callstack] 0x00007ffa23e40597 UnrealEditor-LevelEditor.dll!FLevelEditorActionCallbacks::NewLevel() [D:\build\++UE5\Sync\Engine\Source\Editor\LevelEditor\Private\LevelEditorActions.cpp:252]
LogWindows: Error: [Callstack] 0x00007ffa23e1a817 UnrealEditor-LevelEditor.dll!TBaseStaticDelegateInstance<void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:731]
LogWindows: Error: [Callstack] 0x00007ffa4bfb6d34 UnrealEditor-Slate.dll!FUICommandList::ExecuteAction() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:99]
LogWindows: Error: [Callstack] 0x00007ffa4c09e65a UnrealEditor-Slate.dll!SMenuEntryBlock::OnClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1121]
LogWindows: Error: [Callstack] 0x00007ffa4c09f6d0 UnrealEditor-Slate.dll!SMenuEntryBlock::OnMenuItemButtonClicked() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1081]
LogWindows: Error: [Callstack] 0x00007ffa4c081684 UnrealEditor-Slate.dll!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,1,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
LogWindows: Error: [Callstack] 0x00007ffa4c12acb6 UnrealEditor-Slate.dll!SButton::ExecuteOnClick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:465]
LogWindows: Error: [Callstack] 0x00007ffa4c155d4d UnrealEditor-Slate.dll!SButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:390]
LogWindows: Error: [Callstack] 0x00007ffa4c09f7cc UnrealEditor-Slate.dll!SMenuEntryButton::OnMouseButtonUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:415]
LogWindows: Error: [Callstack] 0x00007ffa4bed5984 UnrealEditor-Slate.dll!<lambda_51e270ca99ea7ce852539efd04dd453f>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4929]
LogWindows: Error: [Callstack] 0x00007ffa4beb7bac UnrealEditor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_51e270ca99ea7ce852539efd04dd453f> >() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:398]
LogWindows: Error: [Callstack] 0x00007ffa4bf39a57 UnrealEditor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4915]
LogWindows: Error: [Callstack] 0x00007ffa4bf2082c UnrealEditor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5463]
LogWindows: Error: [Callstack] 0x00007ffa4bf12984 UnrealEditor-Slate.dll!FSlateApplication::OnMouseUp() [D:\build\++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5428]
LogWindows: Error: [Callstack] 0x00007ffaa06ecf53 UnrealEditor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2210]
LogWindows: Error: [Callstack] 0x00007ffaa06da983 UnrealEditor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2699]
LogWindows: Error: [Callstack] 0x00007ffaa06ef501 UnrealEditor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1078]
LogWindows: Error: [Callstack] 0x00007ffaa06d55a3 UnrealEditor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:916]
LogWindows: Error: [Callstack] 0x00007ffad5f763ed USER32.dll!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ffad5f75de2 USER32.dll!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ffaa06f0904 UnrealEditor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\build\++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:139]
LogWindows: Error: [Callstack] 0x00007ff61a37718a UnrealEditor.exe!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5187]
LogWindows: Error: [Callstack] 0x00007ff61a39119c UnrealEditor.exe!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183]
LogWindows: Error: [Callstack] 0x00007ff61a39128a UnrealEditor.exe!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
LogWindows: Error: [Callstack] 0x00007ff61a3940dd UnrealEditor.exe!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
LogWindows: Error: [Callstack] 0x00007ff61a3a7a14 UnrealEditor.exe!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
LogWindows: Error: [Callstack] 0x00007ff61a3aa8c6 UnrealEditor.exe!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
LogWindows: Error: [Callstack] 0x00007ffad5267bd4 KERNEL32.DLL!UnknownFunction []
LogWindows: Error: [Callstack] 0x00007ffad63aced1 ntdll.dll!UnknownFunction []

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Fixed
ComponentUE - Anim - Sequencer
Affects Versions4.275.0-early access5.05.0.15.1
Target Fix5.0
Fix Commit18527328
Main Commit18527341
CreatedJan 5, 2022
ResolvedJan 6, 2022
UpdatedMay 16, 2022