I'm looking at the question Multi-round Transposition/Playfair as a secure hand cipher in the computer age . When I click on the tag playfair at the end of that question, I am taken to https://crypto.stackexchange.com/questions/tagged/playfair which has a list of some questions that have the "playfair" tag.
I expected that list to include all the questions tagged "playfair", including the original question I was looking at.
What I actually see is only 2 questions on that list, "How many keys does the Playfair Cipher have?" and "How to attack a classical cipher using known partial plaintext?", but not the original question.
Is this a bug, or is there some good reason that list doesn't show all the questions I expected it to show? What should I do about it?