Editing tags and adding 2 seconds to timestamp causes album to be considered to have been "added today"

As per subject. Had a 500 track compilation which I retagged by adding discnumber 1 through 5 and then renamed files discnumber-track - artist - title. File mod times were incremented 2 seconds to ensure Roon identified change. Last modification date is still 25 June 2014 … yet on rescan it’s an album added today?