Calibre does not KNOW the cover file exists.
The test you ran checks for covers (listed in the DB) that don't exist in reality.
It should have shown up a EXTRA FILES.
Simply move it out of there, then drop it into the MDE or details. That should make it official.
You can also set the LIBRARY (details) cover. by using the MDE: Select the format on the right and click the blue 'cover' icon. (there is a tick box in the Bulk mode of the MDE. just not sure which format becomes the source when more than 1 exists)
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