Inbox message of mention in a comment I wasn't mentioned in

Basically I was tagged as mentioned in a comment, one of several in the thread, and got an inbox notification of it. It was about 20 min after the comment itself was posted, in a community I don’t interact with, with a user I don’t think I’ve ever interacted with before.

Not sure if it’s a piefed problem, a cross-talk problem, or just a random bug, but as per screenshot, it wasn’t intended behavior, and I wasn’t meant to be tagged.

I’ll edit this to include a link to the actual thread if desired. Or if any other info is needed that’s cool too.