Clicking the mentions tab on your profile doesn't always load mentions into the list
You just have to click "too quickly".
Doing anything "too quickly" in discourse is bound to cause issues. I wonder how many bugs I've missed because of deliberately waiting for a page to finish loading before trying to do something.
Yes - Discosearch has additional issues if you do things too quickly.
These results arrived a few seconds after checking the box. And after the results of the search within the topic.