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 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.