In case someone stumbles upon this and is experiencing the same behavoir. At first it didn’t work for me after the upgrade. I skipped core168 because of this error. So i upgraded from core167 to core169 and got the same error message. I removed borgbackup and python3-msgpack
pakfire remove borgbackup
pakfire remove python3-msgpack
Reboot
pakfire install borgbackup
python3-msgpack gets automatically installed as a dependency
After that the borg command is working fine
EDIT: Seems like there is also an issue with Borg mount since a few core updates.
I reverted my VM snapshot to core167. So the mount problem is not related to this one.
See: Borgbackup: no module named llfuse
Greetings Tom