This is just stylistic, and I think it’s because chatgpt knows a bit “better” that there aren’t very many literal photos of abstract floating shapes. Adding “studio photography, award winner” produced results quite similar to SD imo, but this does negatively impact the accuracy. On the other side of the coin, “minimalist textbook illustration” definitely seems to help the accuracy, which I think is soft confirmation of the thought above.
EDIT: I think the best approach is simply to separate out the terms in separate phrases, as that gets more-or-less 100% accuracy https://imgur.com/a/JGjkicQ
That said, we should acknowledge the point of all this: SD3 is just incredibly incredibly impressive.