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https://community.nodebb.org/topic/19273/since-the-last-update-i-can-t-tag-users-whose-names-end-in-a-period-.
Since the last update, I can't tag users whose names end in a period (.) | NodeBB Community
This means that the tagging itself works and they receive a notification, but in practice it is displayed normally without a link to the user.
last updatetag userswhose namesnodebb communitysince
https://buddypress.org/support/tag/users/
Topic Tag: users · BuddyPress.org
topic tagusersbuddypress
https://bbpress.org/forums/topic-tag/users/
Topic Tag: users · bbPress.org
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topic tagusersbbpress