In the middle of my score, one of the parts stops playback

Bizarrely, on bar 12, the cello part of my violin-cello duet stops sounding on the playback, and all I can hear from there on out is the violin part. I've tried restarted the MIDI and audio in I/O in Preferences (I have a Mac and Musescore 3), but that hasn't changed anything. Everything looks right, so I'm pretty sure this is a bug. Help!