Issue: Two word usernames Mentions don't work in Blogs

Whenever I try to mention Artemis Moonsong in the comments in Blogs it doesn't work. It just shows up as an @ symbol with no username at all or the mention goes to the user Artemis instead of Artemis Moonsong.

I'm thinking the reason it doesn't work properly is because she has a space in her user name, HOWEVER in regular forum threads I can mention her without any problems. It only seems to not work in Blog comments.