Setting KeepState as default in LevelSequences makes Sequencer blend animations not as expected

Setting "Keep State" for an animation in sequencer makes the sequence behave differently in Sequencer and in Play Mode. The animations appear to be blending together instead of having normal transitions.

This was reported and tested in 4.20.3 (CL-4369336). This was reproduced in 4.21 (CL-4541578) and Main 4.22 (CL-4594480)

You will need to make sure the below line is added to the DefaultEngine.ini

[/Script/LevelSequence.LevelSequence]
DefaultCompletionMode=KeepState

1. Download and open the attached project
2. Open the Level Sequence "SkeleSequence"
3. Play the Sequence a few times
4. Play in Editor to also see the Sequence

Results: When adding animations one after another in sequencer they start to blend together

Expected: Only current animation(s) should be affecting the skeletal mesh. State of the animation should be kept when the whole sequence ends, or until the next animation in sequence starts.