A minor issue, but the library size will increase unnecessarily over time.
Library cleanup is not case sensitive. When a filename is edited, case only, a duplicate entry is created in the library (mp3tag.db3, mtfile table).
e.g., If I change file:
%myfilepath%\1.06 The Beatles - Lucy In The Sky With Diamonds.flac
to
%myfilepath%\1.06 The Beatles - Lucy in the Sky with Diamonds.flac
Two entries appear in the mtfile table for a single file reference. Cleanup does not resolve/remove the duplicate entry.