So I have the same problem; Playing a video with subtitles glitches the video and/or puts the audio out of sync. If subtitles are turned off, no problems.
This started happening in mid-september 2022 out of nowhere, I watched new episodes of two shows as they released, halfway through the seasons for both shows this glitch started appearing with no explanation.
Solution: I either had to watch without subtitles, or burn them in.
Sometime in December I think, I randomly tried to play one of the shows again with subtitles and it suddenly worked. I tried the other show but that still doesn’t work.
Now I’ve found this thread and the comment about a maximum of 30 subtitle tracks, so I decided to try and remove the subtitle tracks so that it was under 30, and what do you know, now it works.
That is great and all, but could a developer please give us an explanation to why this random limit suddenly appeared at all?
EDIT:
So I went back and figured out when exactly it started happening to me, sometime between September 19th and September 23rd.
There is one update that happened during this time:
