Shulker duplicates (including its contents) | Experimental Mode active

I broke the shulker box and it duplicated, including its content. Before breaking it I may have removed one shulker from atop of it and there may have been one shulker beneath it while I broke it. If so, all shulkers would have been facing up  [^IMG_2897.MOV]

Addition: one day later I noticed another shulker duplication. I don’t remember breaking them recently IMG_2902.MOV