This one: Could Discourse offer a StackExchange-like SSO/Federated login service? and this one: WordPress comments are showing were showing “1 unread” message. This was just before I created this topic we’re in.
Not sure what was happening on the “blue dot” front, as I didn’t pay too much attention to this.
I do understand all you say and it was indeed what I had in mind. I am (pretty) sure the blue icon wasn’t supposed to be there. They weren’t watched automatically because of time spent in it. As said, I believe I never opened them, and I checked afterwards, they were on “normal” for both of them.
On my previous visit of meta today, I believe there was one topic with this “problem”. I didn’t bother looking too much, so I don’t remember which one, and I’m not totally sure. But what’s described in the beginning of this message, I’m quite confident it happened and shouldn’t have. I think I never saw that before today. Hope it may help.