Prioritization and scheduling of this bug is tracked on Mingle card https://mingle.corp.wikimedia.org/projects/flow/cards/287

This happened again on this edit:
https://pt.wikipedia.org/wiki/WP:Filtro_de_edições/Solicitações?diff=37053459

As reported at
https://pt.wikipedia.org/w/index.php?diff=prev&oldid=37057524
the notification is also not sent if I just replace "*" by "#" in the previous comment before posting my reply:
https://pt.wikipedia.org/wiki/Project_talk:Notifica%C3%A7%C3%B5es?diff=37057373

kwwilliams wrote:

Is https://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_(technical)&diff=576336920&oldid=576336131 impacted by this?

bsitu wrote:

mention is unfortunately triggered based on text pattern match, it sounds like the pattern misses something, I will see what can be improved,

This edit didn't generate a mention notification either:
https://pt.wikipedia.org/w/index.php?diff=prev&oldid=39309001
Was it because of the accidental "]"?

Also note about edits that only add content, but had to change an existing line to do so:

https://en.wikipedia.org/w/index.php?diff=616264280

== Topic ==
Text. --Foo
: Foo, bar baz. --Bar

Then changed to:

== Topic ==
Text. --Foo
: [[User:Foo|Foo]], bar baz. --Bar

• Bug 58034 has been marked as a duplicate of this bug. ***

Another example: the edit https://pt.wikipedia.org/w/index.php?diff=41245885 by @Cainamarques didn't trigger a notification.

In T56639#1012950, @He7d3r wrote:

Another example: the edit https://pt.wikipedia.org/w/index.php?diff=41245885 by @Cainamarques didn't trigger a notification.

There was no new mention of you, just a rearrangement of an existing one:

[[Usuário(a):He7d3r|Helder]] 00h59min de 4 de novembro de 2014 (UTC)

In T56639#1013190, @Mattflaschen wrote:

There was no new mention of you, just a rearrangement of an existing one:

There was this: {{U|He7d3r}}.

You're right. My mistake.