I think this is related to another issue I’m having, where my mixer is copying the audio from the entire project to a new recorded track (even with all mics and headphones unplugged and all levels turned to 0).
When I go to record a new track, and I click “Solo”, it still plays the audio from the entire project. It doesn’t play the audio if I’m just listening to a playback, without recording. It only plays all the audio when I’m recording.