Issues playing movieclips in main timeline | html canvas

Hi everyone!
I have an old project I made in Animate cc (a couple years ago) where I have an HTML frame with some navigation buttons, and a canvas content created in Animate. The content of this canvas is simply a collection of movieclips in the main timeline (one mc on each frame and this.stop in each frame, 8 movieclips) and inside each one of this movieclips there are some animated content. With the navigation buttons I just go to next or prev frame and voilá, the content of currentMovieclip is played automatically.

Right now, I want to use the same scheme to a new project, but I found that movieclips doesnt play automatically, it just load but stops in the first frame. I have tried to force play but adding "this.play()" on the first frame of each movieclip, but nothing happens, I also tried ti play it after the main frame timeline stops, like "this.stop(); then this.mc1.play(); or this.mc1.gotoAndPlay(0);" but nothing works.

I read something in stackoverflow about some animate cc bugs  but I cant find a way to fix this issue in my project, do you have any idea??

Thank you very much in advance.