Seems to be related to this:
Upgraded to the current beta and had a flood of users pop up in the review queue. These users had been imported from an old vBulletin database, and have yet to log in to the new Discourse forums. Thus they have full bios, but no read posts.
I bridge @Roman_Rizzi is in the case!
I pushed a fix. Take a look at:
Thanks. I’ll try turning this feature back on after we next upgrade.