Mobile apps may do it differently, but Lemmy-UI doesn’t do it, and the Lemmy backend won’t notify people with a plain mention without an embedded link.

If you want to ping them you have to do it as a link like this @Dasus@lemmy.world Just @ing their username doesn’t work yet. You’ll also have to do it as a new comment since edits won’t notify them.

Come Mr Taliban, tally me banana.