Refer to meta post Question incorrectly marked as duplicate of question about an unrelated game, where a question (Can I build infrastructure on a town's seed tile without affecting town growth?) was marked as a duplicate of two questions — one correctly, and the other incorrectly. The incorrect duplicate was (Pokémon Y megastone problem), which is a question about a completely unrelated game. The issue has since been resolved; the erroneous duplicate has since been removed from the list of duplicates, leaving only the correct duplicate:
So far so good. However, the "Linked" questions has not been updated to reflect this. It still shows:
Pokémon Y megastone problem is still considered a "Linked" question. This is a bug.