T32750 is going to be released next Thursday, March 15. With this, any link in the edit summary that points to someone else's userpage (not a subpage) will ping them. Looking at the code, I think Popups might be affected if someone were to take actions on a userpage.
Disabling the ping is easy: Just prefix with a colon, like [[:User:MusikAnimal]].
I am not sure if pings are actually desirable here, but I'm creating this ticket as a heads-up, just in case.