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So the use of a local reference to the value held in any of the concurrent maps, for example a set of string values for the email addresses of some user UUID, is not guarded against concurrent modifications.

I believe the checks may fail between the if-statements, in case the set is changed in an unpredictible way. We've just recorded log-statements where the non-unique value is empty, hinting at it being cleared after the check of it being empty.

I'll try to address this in a fix.