Closed captions still disappearing with custom CC toggle button?

I started experimenting with accessibility today, and discovered this issue:

Closed Captions disappear after each break in audio 

Toggle Closed Captioning 

I've tried Lilybiri's workaround from the first link, but I haven't got it working yet. (Maybe I need to start a new project and try again.)

I know this has been discussed before, and I've already submitted a bug report for it, but it's been 9 months since the first link was posted. Is there any indication Adobe is working on including this in an update? (Especially since there seems to be a hotfix that can't be shared.)

Thanks!