Tracks that manipulate byte properties may have different (non-deterministic) results even for the same frame

This issue is relatively easy to reproduce, e.g., in the timing of switching between the two types of property operations within the same track. It seems to be easy to reproduce the above problem in the timing of switching.There does not seem to be any dependencies between UMovieSceneBytePropertySystem and UMovieScenePiecewiseByteBlenderSystem, such as DefineImplicitPrerequisite. Adding the following code seems to give a definitive result. 

UMovieSceneBytePropertySystem::UMovieSceneBytePropertySystem(const FObjectInitializer& ObjInit)
	: Super(ObjInit)
{
	BindToProperty(UE::MovieScene::FMovieSceneTracksComponentTypes::Get()->Byte);
 
	if (HasAnyFlags(RF_ClassDefaultObject))
	{
		DefineImplicitPrerequisite(UByteChannelEvaluatorSystem::StaticClass(), GetClass());
#if 1  // add_start
		DefineImplicitPrerequisite(UMovieScenePiecewiseByteBlenderSystem::StaticClass(), GetClass());
#endif // // add_end
 
		DefineComponentConsumer(GetClass(), UE::MovieScene::FMovieSceneTracksComponentTypes::Get()->Byte.PropertyTag);
	}
} 

There is no clear procedure to reproduce this, but it sometimes happens when you create a track that changes the Byte property in Sequencer and keep playing that sequence. 

[UE-23848] Bug Status

"Session Disconnected" UEFN

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