Release dates of music files changing after editing

I've been going through and updating the metadata in my iTunes/Music library. For things like "Best Of" albums I like to have the individual songs have their original release date so if I make a playlist of 80s music it finds all songs from those years and doesn't exclude something of the era from a compilation album released in the 2000s.

I've been finding that when I go back into Music some time later, the release dates have changed back to the original. To make it harder to track down, it doesn't seem to happen all the time or to every song on an album.

Anybody else getting this issue?