Musescore 4 playback not working on this one particular score

Hi, I just downloaded Musescore 4 a couple of days ago and wanted to transcribe a piece I liked onto ukulele. At some point while I was transcribing, I switched to bluetooth headphones for a few minutes just to see what it sounded like, then switched back to my laptop's native speakers. This is where the playback stopped working. The blue line would appear for a millisecond then disappear, and the play button would turn into the pause button for the same extremely short duration then go back to being the play button. I tried everything—checking my I/O preferences to make sure I had the right outputs selected (I had only my laptop's default speakers system available), resetting all preferences, restarting my laptop, uninstalling and reinstalling the program, performing a factory reset, all in that order; NOTHING worked and this whole experience has been incredibly frustrating and disheartening. Might just give up on this whole ordeal altogether. I made a new score just to see if the issue was universal, and to my surprise playback worked fine on the new score so the issue is probably exclusive to the original score. I've tried changing and resetting all sorts of options and nothing's worked. I'd hate to start over from scratch but if I find no solution, that's my only option. Really hoping someone can help me out on this, thanks.