I encountered this glitch when creating an account for a user. The username of the created account is "michail " and the erroneous conflicting username is "Finanzer"
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There was a rename of the user
https://meta.wikimedia.org/wiki/Special:Log?type=move&user=&page=User%3AFinanzer&wpdate=&tagfilter=
AntiSpoof seems to report also the old name in this case.