Strange behaviour lookup list for undefined albums

Got this a few times. When searching an album in the list with Artist and Album filled, Roon doesn’t list the album. Blanking the artist, the album is displayed in the list. Then, when I type the artist name exactly as in the displayed list, and do a search again it is not found… I’ve got this with Artist: A.S. Album: Sidetracked, Blacksmith Blues Etc
Blank A.S. and it is found. Add A.S. and it is not found.