PLEX missing some subtitles Xbox One

In some movies that have foreign language scenes with subs, it will stream most lines. But sometimes it misses a line of the subbed dialogue. It’s a very strange problem. I tested on my PC and the sub plays perfectly fine for all lines. Anyone know a solution to this?

Sorry, the thread got posted twice somehow.

Update: I tried the same movie file, and the line plays correctly on the Apple TV. I tried again on the Xbox, and it missed the same line. It get’s the previous 3 or 4 sentences, and then misses the last one. I really can’t understand this.

Update2: I found a fix. When I set the Xbox PLEX subtitle setting to “Subtitle burn: Always” the missing subtitle lines now work. Such a strange bug, at least I think it’s a bug.