SOLVED: BTRFS Subvolume create/delete fail

Problem has been resolved, though I’m unsure why it had happened.

Immutable flag was set on /mnt2/tempraid, meaning that the contents of /mnt2/tempraid was unmodifiable (though decendants could be altered).
I know I didn’t set the flag, and according to BTRFS IRC, scrubs do not set the flag in the event of error.

Problem was resolved with

chattr -i /mnt2/tempraid

Should have thought of it before - in fact, I could swear I checked it, but apparently I did not.

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