Please refer to previous revisions if you know what to do.
The patch proposed was merged into kernel in 5.8 release, but no longer working as of linux 5.11
Yes, that was also my biggest take home message
https://bugzilla.kernel.org/show_bug.cgi?id=60824#c167
Not sure if this is mentioned or no since this gist is too long...
Plugging the cheap USB Bluetooth adapter in the USB 2.0 port was the fix for me (prev. was in USB 3.0 [the blue one])