I'm using a Raspberry Pi4 with RaspberryOS bullseye. RaspberryOS is
Debian with some modified packages: in particular  a personalized
kernel.

RaspberryOS Bullseye has recently updated the kernel to 6.1 (against
Bullseye's 5.10). I have installed the backported version of
btrfs-progs for matching the kernel version (and solving some bugs),
so now I have btrfs-progs 6.1.

The problem: running btrbk now i get this (informative) warning:

WARNING: Failed to parse subvolume detail "Send transid: 0" for:
This push my server to send a mail every time btrbk run.
It is discussed heare: https://github.com/digint/btrbk/issues/422

My proposed solutions (if possible):
- Backport btrbk 0.32.5-1 from testing
- or patch btrbk with the change of one code line (see
https://github.com/digint/btrbk/commit/74be074e6f0347dd729ea450fd5811dc1500f2f8)
(whitch I have done).

This problem should show up for every bullseye user with backported kernel
and btrfs-progs, not only in my setting.

Thank for yours attention.