I just noticed on Meta a bug where muting a topic is still sending me notifications about the topic. Upon looking into this specific case, it’s even stranger.
Here’s the scenario:
I am “Watching” the plugin category. I started getting email notifications about this topic: Discourse Voting
I don’t want to receive notifications on this topic, so I muted it.
I’m still receiving notifications
Stranger still, I can’t see the topic listed on the plugin category page at plugin - Discourse Meta