Command 'this.stop' is buging in Animate CC 2019.

Ive came to conclusion that it doesnt function as it should while 'advanced layer' is turned on.

Same example with 'advance layers' being turned off works normally.

Did anyone face the same problem and is the solution found?

I started working on banner in 2019 version and came across on rather unusual problem, so let me simplify.

In first layer in first frame i have movieclip and  animation inside movieclip .

On main timeline ive added 'this.stop()' and as expected animation stays at first frame, but aswell it stops animation in movieclip which should not be the case.

Can someone explain why?

I found out that when option 'advanced layers' is turned on it turns all layers become movieclips and can access the symbol only through a layer.

Ive experimented with this, but i didnt solve problem.

After certain time of experimenting ive came to conlusion that as long as the second frame is within the first one (f5 on second frame) animation inside

movieclip will work.Can someone explain why?