This is a specific example of the (previously reported) generic bug, that 'spun off threads' doing things like volume leveling, or tagging, or whatever, all seem to 'freeze' a version of tags etc. before they start, and they update using that 'frozen' version without checking what all might have been changed while they were off doing their thinking.

All sorts of things can get lost that way. 8<,

MM3 RC2:

When I am analyzing volume and have changed track title, and have not yet saved the value back to the mp3 ... it changes back to the info in the MP3. I am also using File Monitoring on this folder.