Failing at https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TitleBlacklist/+/442850/
https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-hhvm-docker/6239/
https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-hhvm-docker/6239/artifact/log/should-be-able-to-create-account.png

..
[authentication] ILLEGAL new account 'User-0.46091149577827273-Iñtërnâtiônà lizætiøn☃' Contains unassigned character "☃" (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.