"Remove watched" feature keeps working after first activation, essentially auto-removing videos

[Tallefer]

Checklist

• I am using the latest version - 0.21.14
• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one bug. I will open one issue for every bug report I want to file.

Steps to reproduce the bug

1. Make a playlist, add some new videos to it, go to bookmarked playlists tab, open that playlist.
2. Press "Play All" and watch some videos, but not all of them! Then stop playback, back/cancel to the playlist.
3. Press "Remove watched", then "Yes, and partially watched videos" (I can't test the "Yes" variant because of this bug Videos can't have "watched" status and/or "Remove watched" doesn't work and/or "playback position" feature is bugged #7563 ). Some videos are removed now, including the one which was playing last (obviously).
4. Press "Play All" again to continue watching videos one by one.
5. Stop after watching through at least one, then back/cancel to the playlist view.

Actual behavior

All watched videos including the currently played are removed (I think it happens immediately after each one finishes playing)

Expected behavior

Nothing should happen, supposedly you'd need to activate removal feature again for it to work?

Screenshots/Screen recordings

Logs

Device info

• Android version/Custom ROM version: 5.1.1
• Device model: SM-J120F

[triallax]

Reproduced. This is a relatively destructive bug, so we should try to fix it soon.