Thanks for the response. It triggered the necessary paranoia in this case.
It turned out to be two issues in unison, neither of which was the one in the title.
- My car audio player is glitching, its steering wheel controls and console buttons don’t work until I power it off and on again (basically on-off-on and it just works)
- The Bluetooth sticky cache issue made it so that only some buttons in my JBL TUNE750BTNC headset worked. I removed all devices, deleted the cache, and re-paired everything, now it works.
If I still can, I’ll mark the title and first post as invalid.