"Experimental PGS subtitle rendering" not working

[mistamoronic]

So interestingly, when I played Interstaller on the Jellyfin Media Player and it worked, and showed the subtitles, I went back to my TV to try and get the log for you and it shows the subtitles now on the TV. Is it just that I have to wait for the subtitles to load or something? I noticed when I was first playing Interstellar on the TV that it was like buffering a little bit, with no subtitles.

Here are the logs for the same thing happening with Harry Potter, no subs and the movie is stuttering/buffering at times.
https://pastebin.com/3AA6ub3p
https://pastebin.com/30HjkJvW
https://pastebin.com/xwg9YgU6