RAW file Quick Look broken in MacOS 15.4

It looks like Apple MacOS 15.4 (even the .1 patch) has broken Quick Look (using the Space key in Finder) for some RAW files from cameras, as the previews for .cr2 files from (somewhat) more recent cameras like my Canon EOS 5D Mk IV and my previous Canon EOS 5D Mk III now just show a black image with Quick Look, but using the main Preview app to preview them still works correctly. Interestingly,…