I've also experienced this on Arch Linux, in the form of a variable delay to my bluetooth speaker under pipewire but not pulseaudio. I also noticed a lot more g

I've also experienced this on Arch Linux, in the form of a variable delay to my bluetooth speaker under pipewire but not pulseaudio. I also noticed a lot more general bluetooth flakiness. I have not characterized the issue nearly as thoroughly as you have. Instead I ran a wire to the other side of my office and installed some DIY speakers, which rendered the problem moot. Regardless, I've always had issues getting bluetooth to work reliably, especially on linux.