@nprofile1q... Yep. It seems counterintuitive, but if the bitrate is *too* high, it fails to play correctly. Luckily, you can use that exact fide file, compress it to about 4Mbps, and it won't have the playback bugs (unless the file is truly corrupted, in which case you'll need to start from scratch. In that case, just set your editor export to 30 crf).

I'm a big nerd for video compression. I've rendered videos with obscene bitrates, and while all the framedata is fine, playback looks glitchy.