Mentions are displayed in the event stream of a wiki as addressed to the current user when they're actually not

So closing as cannot reproduce since the error doesn't happen anymore in XWiki 16.10.15, and we now have a consistent behaviour, which is to never display targeted event (and mention notification are targeted event) when the notifications macro is called with `useUserPreferences="false"`. So we can't reproduce because the notification is just never displayed.

Note that in 12.10.5 it was already the case in the main wiki: the issue could only be reproduced in subwiki where the notification used to wrongly appear.

Apparently it stopped to appear in XWiki 13.10.3 in subwiki, I'm not 100% sure what fixes it, I think it's probably related with XWIKI-19400 but maybe this ticket prevented getting the event and we later on fixed that.