You correctly identify a bug. Here is another bug, which is less consistent. Posts in discussion have two URLs, one marked discussion, one not. For this open thread, here is the discussion link. Its tag links in the lower right corner of the post send you to discussion posts (but the tag links in the article navigation don’t). I got that discussion link from a page of new discussion articles. But if I instead go to Coscott’s submitted page, I get this link, which looks like it’s in main, with tag links also in main.
You correctly identify a bug. Here is another bug, which is less consistent. Posts in discussion have two URLs, one marked discussion, one not. For this open thread, here is the discussion link. Its tag links in the lower right corner of the post send you to discussion posts (but the tag links in the article navigation don’t). I got that discussion link from a page of new discussion articles. But if I instead go to Coscott’s submitted page, I get this link, which looks like it’s in main, with tag links also in main.