In the "Listens" and "Charts" page in Listenbrainz.org, the image associated to a release is not always the front cover. I see it happening for "Japanese Breakfast - Soft Sounds from Another Planet" (see screenshot) and "파란노을 - To See the Next Part of the Dream".

In both case, the image displayed is the first from index.json, but it has attribute "front" set to false, while another of the images has attribute front to true.

See https://ia902804.us.archive.org/5/items/mbid-eb257724-923b-419f-855f-11a5085a9d27/index.json and https://ia601802.us.archive.org/34/items/mbid-bb1a27fa-2a72-488e-94f8-a36b12e85343/index.json

Note also that in the musicbrainz release page, the cover is the right image – see https://musicbrainz.org/release/eb257724-923b-419f-855f-11a5085a9d27.