Failing at https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TitleBlacklist/+/442850/
.. [authentication] ILLEGAL new account 'User-0.46091149577827273-IÃ±tÃ«rnÃ¢tiÃ´nÃ lizÃ¦tiÃ¸nâ˜ƒ' Contains unassigned character "â˜ƒ" (U+2603) ..
Looks like one of the characters added by https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/441191/ is considered illegal by AntiSpoof. Seems like we should change the default "random" suffix.
Note that this is not the same as T198137 - that test is flaky, this one however, is consistently passing when run without AntiSpoof installed, and consistently failing with it installed.