Unreal Engine Issues

UE-131206

Crash adding subscene to a looped subscene - MovieSceneSequenceTransform.h - WarpCounts.Num() == NestedTransformsSize

Crash adding subscene to a looped subscene - MovieSceneSequenceTransform.h - WarpCounts.Num() == NestedTransformsSize

Description

Crash adding subscene to a looped subscene. Note this did not repro with brand new sequences not sure what's different about this older content.

This also occurs in Release-5.0.

Steps to Reproduce
  1. Open QAGame
  2. Create and open a level sequence
  3. Add a subscene track
  4. Add LogoSubscene to the subscene track
  5. Right click on the subscene section and enabled Properties > Can Loop
  6. Drag out the section a couple times
  7. Expand the playback range to match the new section length
  8. Double click on the LogoSubscene
  9. Add a subscene track
  10. Add Sequencer-CopyPaste_Spawnable to the subscene track

Result: Crash

Callstack
LoginId:6e314f9e419e0c4f57a1a7a5f28c08da
EpicAccountId:7a86ba22230a43bdb5deace6a997aa49

Assertion failed: WarpCounts.Num() == NestedTransformsSize [File:D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Public\Evaluation/MovieSceneSequenceTransform.h] [Line: 443]

UE4Editor_Core!AssertFailedImplV() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:104]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:461]
UE4Editor_MovieScene!FMovieSceneSequenceTransform::InverseFromWarp() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Public\Evaluation\MovieSceneSequenceTransform.h:443]
UE4Editor_MovieScene!UMovieSceneCompiledDataManager::GatherTrack() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Private\Compilation\MovieSceneCompiledDataManager.cpp:1288]
UE4Editor_MovieScene!UMovieSceneCompiledDataManager::Gather() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Private\Compilation\MovieSceneCompiledDataManager.cpp:858]
UE4Editor_MovieScene!UMovieSceneCompiledDataManager::CompileSubSequences() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Private\Compilation\MovieSceneCompiledDataManager.cpp:920]
UE4Editor_MovieScene!UMovieSceneCompiledDataManager::Compile() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Private\Compilation\MovieSceneCompiledDataManager.cpp:775]
UE4Editor_MovieScene!UMovieSceneCompiledDataManager::Compile() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\MovieScene\Private\Compilation\MovieSceneCompiledDataManager.cpp:686]
UE4Editor_Sequencer!FSequencer::Tick() [D:\Builds\ReleasePrevious\Engine\Source\Editor\Sequencer\Private\Sequencer.cpp:673]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [D:\Builds\ReleasePrevious\Engine\Source\Editor\UnrealEd\Public\TickableEditorObject.h:45]
UE4Editor_UnrealEd!UEditorEngine::Tick() [D:\Builds\ReleasePrevious\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1502]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [D:\Builds\ReleasePrevious\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:426]
UE4Editor!FEngineLoop::Tick() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4922]
UE4Editor!GuardedMain() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Launch\Private\Launch.cpp:178]
UE4Editor!GuardedMainWrapper() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!LaunchWindowsStartup() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:273]
UE4Editor!WinMain() [D:\Builds\ReleasePrevious\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:320]
UE4Editor!__scrt_common_main_seh() [d:\a01\_work\2\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed
ComponentUE - Anim - Sequencer
Affects Versions4.27.1, 5.0
Target Fix4.27.2
Fix Commit17846995
Main Commit17874094
Release Commit17846995
CreatedOct 11, 2021
ResolvedOct 18, 2021
UpdatedDec 1, 2022
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