Thanks for posting this!
I have been watching the terminal output of sudo iotop -a on and off for a past couple of weeks.
I did notice an unusually high write rate associated with another btrfs process as well, namely btrfs-transaction (?).
I wanted to post about it on the forum and ask about it but I didn’t get around doing it.
Below is an screenshot of the terminal output of sudo iotop -a after 5 minutes uptime with nothing else but the system running:
here is another one after 20 minutes uptime, with Firefox (one tab) running in the background:
Does anyone know it this is also related to the above mentioned regression?
I need to add that this is after I applied the workaround posted above.