An analogous audio binding issue used to happen with my Jabra Bt headphones. It was generally connected to my phone and my computer. After finishing a phone call — if previously the computer was playing some music — the music would turn back on but it would be a very poor quality, I suspect the audio "mode" was stuck at "transmitting" phone call audio quality even though the BT software on the headset detected devices being switched from phone -> computer. Toggling the BT sound output on the mac to and fro between Computer and Headphones, fixed it.

I suspect it was probably a vendor — jabra — software issue when sending a signal to apple's BT stack when switching between types of devices? But probably not worth fixing on my own.