The reason I'm certain is I spend an hour or so most days cleaning up and resyncing subtitles .. and there are often discrepancies between subtitles for first release Vs later streaming Vs DVD Vs BluRay releases still to this day.
This happened for a recent (within last two years) TV series that had a sound track that went from great (first release in country of origin) to "blah" on second international streaming release.
Probably UK? - It'll come to me (dammit).
Point being, yes, this stuff still happens.
Even older TV series differ between 10+ year old DVD box sets and this years streaming release - entire episodes get dropped, others get recut with scences dropped.
Then years after the show went off the air, they released DVD versions that stripped out every single song and replaced it with random royalty-free music. It really hurt the episodes.