Design issue @[name] User mention does not work

[Veer]

I have noticed some user registerations starts with [ and ends with ]. In that case user mention does not seem to work. For example @[username]

 

[Mike]

This has come up before (https://xenforo.com/community/threads/users-with-in-it-cant-tag-in-posts.102944/#post-969051) and it's essentially a limitation with things that look like BB code. It's a side effect of having usernames that look like markup.