This mention didn't cause a notification:
https://www.mediawiki.org/w/index.php?title=Talk%3ASnippets%2FHorizontal_lists&type=revision&diff=1936403&oldid=1936390
I remember problems like this before, but I'm not sure what is the cause this time:
- T55132: Notifications are not sent when a user mentions another if the signature of the sender contains localized namespaces
- T66778: Echo: Remove the signature-requirement for Mention notifications
- T73353: Echo pings are not recognized if the signature uses custom namespace alias (defined per-wiki, rather than for the language)
- T75366: New comments are not generating mention notifications when signature is non-standard
- T76961: Echo Mentions should trigger, if a signature only contains a usertalkpage link, and not a userpage link
- T78424: P4. Spike - Figure out causes of mention notification not being sent (missing pings)
- T85730: Echo not notifying users in ns103 in cawiki