I've noticed a few games listed as 64DD games that actually never came out for the system since they were only PLANNED to be released for the 64DD - like Zelda: Ocarina of Time. I don't think they should get tagged as 64DD games for that reason. There should be a note or a paragraph about that on each game's wiki page about the 64DD plans or origins but that's it. I'm not referring to canceled games but more about games like Mother 3 or Ocarina where they started out on 64DD but then were eventually only released for the regular N64 (or in Mother 3's case, the GBA).
Anyone disagree or is there even an official rule about matters like this?