This happened recently to a user and I just confirmed it's a bug, starting on v6.7.0 when for example removing a device from a 2 device raid1 pool, the command changed from:
balance start -f -dconvert=single -mconvert=single /mnt/cache && /sbin/btrfs device delete /dev/sde1 /mnt/cache &
to
balance start -f -dconvert=single /mnt/cache && /sbin/btrfs device delete /dev/sde1 /mnt/cache &
The metadata isn't being convert to single profile, so the device delete will fail, and Unraid will keep trying every array start.
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