Playlists not updating

[github-account1111]

Shuttle version:

v2.0.17

Device, OS:

Android 12

Description of bug:

When I add a new song and that song's entry to a playlist with e.g. 12 tracks, the song does appear under Songs, but the playlist still only contains 12 tracks.

Steps to reproduce:

1. Add a track to the Music folder
2. Add an entry to an existing playlist (m3u8)
3. Seach for the track inside the playlist

Expected outcome:

The track is listed in playlist (i.e. 13 tracks total if using the example above)

Observations/Actual Result:

The track is not in the playlist, but it is in the general song list.
I've looked into the playlist file using a text editor, and the new entry is there, it's just that Shuttle seems to fail to notice it.