I have a listen - the first one listed here - which was submitted with a release_mbid of 78abe772-e46f-416e-bd06-c8be284fc658. However, it is then mapped with mbid_mapping to a release_mbid and caa_release_mbid of 4269c0ab-06cd-462f-9940-f4f59ddc8184. The cover art displayed for this listen is then drawn from the latter, incorrect release, when it should be using the former.

I would expect any release_mbid submitted with a listen to be respected for cover art (and anything else).