Sometimes an album is re-released years later by different artists and the very same (or mostly the same) songs. For instance:

• https://musicbrainz.org/release/3f48d22d-f1f6-4a96-b038-199753c9a618 
• https://musicbrainz.org/release/58651b56-8e96-4935-b398-585716523ba1

It seems lookup only looks at titles, artists, number of titles and durations, and ends up putting all eggs in the same basket. If it looked at release date (year, preferably), I suspect it wouldn’t incur in that mistake.