Heist rewards duplicate choices

In the same instance (same room), I have 5 curios options, but 2 of them is replica bitterdream, so I only have 4 options... not cool.

Has worked that way since Heist was introduced. Every display is a separate generation of loot with no connection to the others. I know I've seen several clips of 4 of the same common unique in 5 of the displays. So if the last reward is bad, you just take some extra chests on the way out instead and go to the next wing.