I’m testing in the try.discourse.org sandbox. With one userid, I’m tracking the tag ‘art’. With another, I created a topic tagged with that, and a topic with a different tag. Both topics show up exactly the same in the ‘new’ lists, and ‘latest’ and ‘unread’ (ie neither show up under ‘unread’). The same applies if I then use the second ID to reply to both topics - again, the first ID sees no difference between the 2, and neither appear under ‘unread’.
So what does tracking a tag get me? I’ve also tried watching a tag, and that does successfully notify the first userid with the ‘1 notification’ mark on the user. But I expected that I’d see any new topics with a tracked tag under ‘unread’, and replies to a topic with a tracked tag. Is there somewhere else I should be looking for them?