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I recently upgraded to an M3 Macbook Pro and moved my Lightroom catalog over (LR Classic 13.5.1). Everything works fine, but the videos won't preview or play. The video files are all fine, and I can play them in Finder.

After trying everything from reinstalling lightroom to deleting caches and preview files and plugins to ensuring that Lightroom has full disk access, I came across a post somewhere that downgrading to LR Classic 13.1 and loaded an old catalog and the videos work perfectly.

I would stay on 13.1, but the old catalog doesn't have the last three months of my photos. This appears to be a bug.