Hello,
This is very annoying, and has lead to quite a few bugs in our game.
If you play animations on the same frame it wont try to blend with the previous animation that played.
For example:
You have animation A Playing
One second later, you play animation B - On the same frame You play animation C
Instead of C Blending with A it will try to blend with B.
This also happens if animation A never played (or that the track was null before animationB played)
This caused animations to appear as if they only played half way through (animationC is 3 frames long, and blend time is 0.2)
If animation B was not played, everything works