Wish for Rust with Destructive Play allocated duplicates mirage boss and drops

In a T16 Beach map with Destructive Play allocated, I selected "Wish for Rust" and entered the mirage. The mirage boss room had the map boss and four of the mirage bosses--each added boss dropped its own Black Barya and they rolled for unique drops multiple times, too: I got 2 Fleshrenders. There were also 4 identical lore interactibles in the arena.