Hi Trizek, this edit to Help:Notifications/Notifications types added "Mention templates don't work." Do we really want to state in a help page that something not previously defined (either on that page or on the entire site) doesn't work, and not tell why?
Topic on User talk:Trizek (WMF)/Flow
FWIW Help:Notifications/Notifications_types#Mentions does mention them? (As to why, feel free to elaborate. There isn't much to say other than only the listed methods work and everything else is not supported.)
That's how that worked last time I checked, correct. I pinged you while editing Project:Sandbox and you shouldn't have received anything.
Confirmed. Many thanks.