R2 remembered Obi-Wan... and Obi-Wan should have remembered the droids. That is a plot hole. But they made a point of wiping C3PO, but not R2D2.
“Obi-Wan should have remembered the droids. That is a plot hole.”
Well, technically, we don’t know that Obi Wan didn’t remember them. All he says is “I don’t remember owning a droid”, which is true, he never owned R2, because R2 was Anakin’s droid. I do think that Lucas never really planned the prequels that far ahead when he wrote the dialogue, but it’s not a direct contradiction.