Same movie appears twice in Recently Watched (is that a bug or a feature...?)
When pressing select on a movie in the Recently Watched list, the pre-playback view will not show the cover art but a random frame from the movie. When pressing select on the same movie in the grid view, the pre-playback view correctly show the cover art.
A bit more testing reveals that the issue with pre-playback view is only with local file cover art, and the issue/bug could be rephrased as “pre-playback view does not show local file cover art when entered from Recently Watched”.