We do have a chrome extension that is used to lookup user names when using mentions in Discussions to ensure you have the right user.. and no, this does not work in QDP. The data populates a few seconds after the auto save of the user name in the full view.
I just looked into the docs of our chrome extension, and it appears that this is the piece that is doing it. Makes sense now that I see this but other do not.. my extension works well, but others have been having issues.
Thanks.