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  1. update the game to the version just released an hour ago :D (not necessary for your bug but still ;) )
  2. put at least two ingots on the anvil
  3. hold Z to get the selection menu
  4. hover your mouse over "blunts"
  5. release Z
  6. smack the anvil

So the selection of anvil type has been changed to the way I described, you will get the hang of it soon :)