Similar to T5498: Image history is confusing, currently TimedText content shares many of the same problems with regards to history, but also with regards to something like T122038: Moving/Deleting a video file does not move/delete subtitles files, nor does it inform the file mover of their existence.
The suggested solution is probably similar as well: The Timed text variant of T96384: Integrate file revisions with description page history