hi, i m on 4.4.3. make sure you duplicate the tracks you want to merge. after merging tracks will be without animation data.
i expierienced bugs on a rig, but couldnt replicat...
i guess needs further devolpment.
Men the animation data isn't missing, It's muted. Press H to unmute the strips! There's a couple bugs that need to be fixed yea. I think its mostly due to vector interpolation in the final strip.
quite nice
idk what to say - its just DAMN GREAT!!!
GG to the creator