Here are some examples of movies that are missing covers:
Cranck 2006
Blue Spring 2002
Jurassic World Dominion 2002
The Green Hornet 2011
Ali G Indahouse 2002
Star Wars: Episode IX - The Rise of Skywalker 2019
Star Wars: Episode VIII - The Last Jedi 2017
Star Wars: Episode IV - A New Hope 1977
Star Wars: Episode VII - The Force Awakens 2015
Die Hard with a Vengeance 1995
A Good Day to Die Hard 2013
Star Wars: Episode V - The Empire Strikes Back 1980
Shaft 2000
Drag Me to Hell 2009
Dawn of the Dead 2004
Come and See 1985
What I have tried:
Unmatched, matched again, refreshed metadata
Moving the film out of the movies folder, doing the plex-dance, and adding it again seems to solve the problem, but it will also cause the movie to be re-added and all statistics and viewstates to disappear. Not preferable.
Try the first workaround I mentioned in that link. If that works then you at least can fix it otherwise you’ll need to wait and hope someone from plex has another idea.
Now that I think of it. I do have a complete image backup of my previous installation, but I don’t know which file/folder will restore the covers to their previous ones.