I encountered strange playback of my game's music when loading the PDX into the simulator. I haven't been able to test it on a physical Playdate.
You can view videos of the music playing on the Playdate Squad discord. I couldn't work out how to upload these directly to the forum.
Simulator: Version 1.9.3 (133541)
OS: macOS 12.3 (21E230)
I'm happy to share the JSON and/or PDX if helpful for debugging. Thanks!