Maybe something is a little bit goofy about the end credits. I skipped to them, for entirely selfish reasons, and the video (in VLC) started playing at 2x or 4x or something. It seemed locked at first, but then it did allow me to skip backwards.
I think there have been bugs in the post-credits for Harmy before due to the audio tracks not extending this far. It might just make the muxing kind of wonky, but it’s definitely no problem if the main video plays fine.