If it’s the same issue,
If it’s a different issue, add the following lines in mpv.conf, replace <username> to make the valid path and save it, restart Anki, review a card, wait a few seconds and upload mpv.log.txt from your desktop folder somewhere, or maybe it can be added as a spoiler.
log-file=C:\Users\<username>\Desktop\mpv.log.txt
msg-level=all=debug
If it’s the same issue, it’ll end with this line and adding autoload-files=no to mpv.conf should be able to fix it.
[ 6.645][v][find_files] Loading external files in C:\Users\Nickolay\AppData\Roaming\Anki2\User 1\collection.media\