Hi,
I am running the beta version of LE10 on a rPi4. Noticed that I can not see the embedded subtitles, at least on some anime episodes (not sure if all video has this issue). I tried playing around with the subtitle settings to see if I could get it working but had no luck. In the end I kind of found the subtitles by setting the view mode to "Original Size", then I can see that they are present but displayed to the right of the video (and thus outside of the normally viewable screen).
Attaching the kodi.log (from a nightly to see if the issue remained) and screenshot.