@Parkher
When I bulk download metadata I do only metadata so I can quickly see if the names match the cover. Often the new metadata is far removed from the original book
Then I check them and download the ones that are wrong individually.
If I am doing a lot of books I import them to a temporary library.
Next I copy to main library,switch back to main library and download metadata.
Then I use the find duplicates plugin to find library duplicates in temp library.
Next I type Not in the search bar before marked:library_duplicate.
This gives me a shorter list of possible problem files