[RSS Feed/News] Why don't some users show up when I type @ and their usernames?

[XenForo]

For reasons I cannot understand, for some users, if I type on @<username> it doesn't find them, although once I click to save and post the message, then it does. I was experiencing this today with a user who was last active just over a year ago.

Thanks in advance for your replies.

-S-

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