Hello from 2023 and UE4.27.
I found an issue that increasing/decreasing the Montage play rate seems to have no effect on the Blend in/out TIMING that needs to be preset in the Anim Montage asset.
In other words, when I play the game and have a bind to speed up Player movement (Character Movement > Set Max Walk Speed), then it plays every Montage faster according to the speed multiplier.
But the Blend in/out times stay the same (at 0.5 secs). Thus parts of the fast-playing anim are chopped out, and only a few frames of the middle anim display.
So how do we scale the Blend in/out times - to match a percentage of the actual play rate/new time duration?