Why Didn't Darth Vader Remember C-3PO in The Empire Strikes Back? Star Wars Explained (Legends)

In Star Wars The Empire Strikes Back, on Cloud City with Han Solo, R2D2, Chewbacca, Leia, and the mangled C-3PO, why didn't Darth Vader remember the droid he made as Anakin Skywalker on Tatooine all those years ago?

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