Adding a track for LayerData.Offset throws an ensure that states "No default blender class specified on property, and no custom blender specified on entities. Falling back to float blender." This does not occur in 4.27.
Expected Results:
No errors in the output log.
Actual Results:
Ensure is thrown "No default blender class specified on property, and no custom blender specified on entities. Falling back to float blender."
LogOutputDevice: Error: === Handled ensure: === LogOutputDevice: Error: Ensure condition failed: BlenderClass [File:D:\build\++UE5\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Systems\MovieScenePropertyInstantiator.cpp] [Line: 452] LogOutputDevice: Error: No default blender class specified on property, and no custom blender specified on entities. Falling back to float blender. LogOutputDevice: Error: Stack: LogOutputDevice: Error: [Callstack] 0x00007ffbdaab7437 UnrealEditor-MovieSceneTracks.dll!UMovieScenePropertyInstantiatorSystem::InitializeBlendPath() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Systems\MovieScenePropertyInstantiator.cpp:452] LogOutputDevice: Error: [Callstack] 0x00007ffbdaacc15a UnrealEditor-MovieSceneTracks.dll!UMovieScenePropertyInstantiatorSystem::ProcessInvalidatedProperties() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Systems\MovieScenePropertyInstantiator.cpp:257] LogOutputDevice: Error: [Callstack] 0x00007ffbdaac65b4 UnrealEditor-MovieSceneTracks.dll!UMovieScenePropertyInstantiatorSystem::OnRun() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Systems\MovieScenePropertyInstantiator.cpp:127] LogOutputDevice: Error: [Callstack] 0x00007ffbdadb7993 UnrealEditor-MovieScene.dll!UMovieSceneEntitySystem::Run() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystem.cpp:361] LogOutputDevice: Error: [Callstack] 0x00007ffbdad3329f UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemGraph::ExecutePhase<TArray<unsigned short,TSizedInlineAllocator<8,32,TSizedDefaultAllocator<32> > > >() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemGraphs.cpp:760] LogOutputDevice: Error: [Callstack] 0x00007ffbdad88e34 UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemRunner::GameThread_InstantiationPhase() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemRunner.cpp:424] LogOutputDevice: Error: [Callstack] 0x00007ffbdad8b4b7 UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemRunner::GameThread_SpawnPhase() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemRunner.cpp:405] LogOutputDevice: Error: [Callstack] 0x00007ffbdad8acfb UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemRunner::GameThread_ProcessQueue() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemRunner.cpp:318] LogOutputDevice: Error: [Callstack] 0x00007ffbdad7b464 UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemRunner::DoFlushUpdateQueueOnce() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemRunner.cpp:210] LogOutputDevice: Error: [Callstack] 0x00007ffbdad86558 UnrealEditor-MovieScene.dll!FMovieSceneEntitySystemRunner::Flush() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntitySystemRunner.cpp:177] LogOutputDevice: Error: [Callstack] 0x00007ffbdae0721c UnrealEditor-MovieScene.dll!FMovieSceneRootEvaluationTemplateInstance::Evaluate() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\Evaluation\MovieSceneEvaluationTemplateInstance.cpp:147] LogOutputDevice: Error: [Callstack] 0x00007ffc335f02ee UnrealEditor-Sequencer.dll!FSequencer::EvaluateInternal() [D:\build\++UE5\Sync\Engine\Source\Editor\Sequencer\Private\Sequencer.cpp:3112] LogOutputDevice: Error: [Callstack] 0x00007ffc33684f79 UnrealEditor-Sequencer.dll!FSequencer::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\Sequencer\Private\Sequencer.cpp:823] LogOutputDevice: Error: [Callstack] 0x00007ffbf0099539 UnrealEditor-UnrealEd.dll!FTickableEditorObject::TickObjects() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Public\TickableEditorObject.h:45] LogOutputDevice: Error: [Callstack] 0x00007ffbf056c074 UnrealEditor-UnrealEd.dll!UEditorEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1536] LogOutputDevice: Error: [Callstack] 0x00007ffbf0ef8866 UnrealEditor-UnrealEd.dll!UUnrealEdEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:474] LogOutputDevice: Error: [Callstack] 0x00007ff6933f82f6 UnrealEditor.exe!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5215] LogOutputDevice: Error: [Callstack] 0x00007ff693410d9c UnrealEditor.exe!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183] LogOutputDevice: Error: [Callstack] 0x00007ff693410e8a UnrealEditor.exe!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147] LogOutputDevice: Error: [Callstack] 0x00007ff693413c4d UnrealEditor.exe!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283] LogOutputDevice: Error: [Callstack] 0x00007ff693425534 UnrealEditor.exe!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330] LogOutputDevice: Error: [Callstack] 0x00007ff6934286d6 UnrealEditor.exe!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] LogOutputDevice: Error: [Callstack] 0x00007ffcad227bd4 KERNEL32.DLL!UnknownFunction [] LogOutputDevice: Error: [Callstack] 0x00007ffcaf02ced1 ntdll.dll!UnknownFunction []
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-145913 in the post.