When opening a previously visited topic, sometimes the number of unread posts is showing (even when not tracking the topic)

[schneeland]

I have observed that sometimes, when I open a topic that I have visited previously, but which has new posts, I get an an unread count, even if I am not tracking the topic - today, this happened when I opened the topic in a new tab, but I have also seen this if I visit a topic on mobile but navigate back quickly.

The behaviour seems like what is described in this old bug, which is supposedly fixed.

Example screenshots:

Main page after opening two links in the background:

Tracking status of the thread with unread count:

[NateDhaliwal]

This has happened to me for eons. If you reload the page, it’ll be gone.
Thanks for making the bug report!

[Jagster (Jakke Lehtonen)]

That has bothered all those few years what I’ve used Discourse.

Depending of a day I blaime Apple, DiscourseHub of some timer of Discourse that counts reading time. Or caching.

But that is defenetly not new thing.

[schneeland]

@Jagster

But that is defenetly not new thing.

True. I have to say, I only noticed it on mobile and online when navigating back and forth quickly, before. Having it appear on Desktop is a new thing for me.

Also, I just had it happen even for a topic that I did not visit before: