According to https://www.mediawiki.org/wiki/Echo_%28Notifications%29/Feature_requirements#User_Mention "this feature only works for posts inside a section of a talk page other than yours, or in the Project: namespace (e.g., 'Wikipedia:')"
So possibly there's a namespace restriction in the code, somewhere, that needs to be expanded?
Here we have some data to start working with:
- I didn't recive Qgil's human ping (see above)
- Three out of the 6 pinged (in a page in ns103 but different form the one where we spotted the bug) have not received the ping, the other 3 have not answered yet.
- One person did receive a ping from this namespace the 8th of december 2014.
With this info we know for sure that pings in any page of ns103 of cawiki don't notify the person. It doesn't matter if the "pingger" is a bot or a human. This feature worked the 8/12/2014.