If the twist surprizes both the reader and the protagonist, what trope is it?

I'd like to add the short story "A Man Who Had No Eyes" by Mac Kinlay Kantor. The plot, briefly, is this: It's about a blind beggar who tells how he became blind to a rich man. The beggar explains that he used to be able to see, but he worked in a chemical factory. One day there was a fire, and as everyone ran out, the beggar was knocked down and trampled by a larger man. He escaped in time to avoid being burned, but he was blinded by the chemical fumes. The twist ending is that his story is a lie. The rich man worked at the same plant, and he is the one who was knocked down and trampled by the beggar. The beggar then screams that it is unfair that he had gotten out in time but was blinded, while the man he knocked down was not only all right, but went on to become rich. The rich man then said, "I don't know what you're complaining about. I'm blind too." The twist comes as a surprise to both the reader and the protagonist.

I would agree with timeforgot's narrow interpretation of this trope. In a typical Twist Ending, there is key information that is concealed from at least some of the characters (and the audience), which is then revealed, to the surprise of those characters (and the audience). When the twist is fundamental enough, The Ending Changes Everything. What distinguishes a Tomato Surprise is that there is NO surprising revelation to the characters involved, just to the audience. If any of the characters are just as surprised as the audience, it's just a vanilla Twist Ending.

I think the twists at the end of "A Man Who Had No Eyes" are a use of Unreliable Narrator with an extra And That Little Girl Was Me twist.