I just got the following message in the achievements list on the Stack Exchange main page (100% reproducible):

You've earned the "access to moderator tools" privilege! Learn more about it in the help center.

It seems the subdomain is stripped from links on stackexchange.com - the link should be https://unix.stackexchange.com/help/privileges/moderator-tools, not https://stackexchange.com/help/privileges/moderator-tools. The latter results in a 404 error.



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