The bug is pretty simple. If you have an animation in a subsymbol, and you reference it, and try to play the referenced animation on an animation from the parent, any labels or sounds from the subsymbol’s animation will be ignored. If you have labels and/or sounds on an animation from a subsymbol, they will only work if you call the animation directly. Referencing it won’t work.
Attached is a very simple example project. The sound I got from https://www.zapsplat.com/
test.zpp (504.2 KB)