Not really, but there's a number of theories. The simplest one is that they "style tuned" the AI on human preference data, and this introduced a subtle bias for yellow.
And I say "subtle" - but because that model would always "regenerate" an image when editing, it would introduce more and more of this yellow tint with each tweak or edit. Which has a way of making a "subtle" bias anything but.
That seems unlikely, as we didn't see anything like that with Dall-E, unless the auto regressive nature of gpt-image somehow was more influenced by it.
And I say "subtle" - but because that model would always "regenerate" an image when editing, it would introduce more and more of this yellow tint with each tweak or edit. Which has a way of making a "subtle" bias anything but.