Pamac threw this error (and put up an error window):
Detecting snapshots ... Info: Separate boot partition not detected No snapshots found. If you think an error has occurred , please file a bug report at " https://github.com/Antynea/grub-btrfs " Error while configuring Nothing to do. Abort. Found memtest86+ image: /boot/memtest86+/memtest.bin /usr/bin/grub-probe: warning: unknown device type nvme0n1. done
Will send bug report to btrfs at github (IF there is a bug) as it recommends.
I just rebooted, everything seems to be OK, so I guess this error was nothing to worry about.