Everything works great except the read aloud overlay. The overlay stops in the middle of the page. The read aloud overlay half of the page only.

I inspected the code and notice that -epub-media-overlay is missing in the remaining text. I kept redoing the read aloud to make sure. It works fine when I preview it in Pubcoder, but it's not working in final output.

Is there a way to fix the problem? Any suggestion will help.