Original drops for Mythics have all been removed or Mythic Uniques have been set so high over them as to make it impossible to get them accept the one and only one you can make at the blacksmith. My group and the clan I helped form has farmed every possible drop point and only recieved Mythic Uniques. Blizzard did not remove them from the game, so I suggest the problem is a bug and everyone in the same boat should make a bug report.
Hello there! This forum is for help installing very very old games. An example would be Diablo 2 (2000).
If you wish to provide feedback or report a bug about a current game then you want to post on the forums for that game.
I am guessing you are talking about Diablo 4 so you will want to head over there.