Google Shopping Ads Carousel With Shaded Backgrounds

Google is using a gray shaded background color for some of the results within the Google Shopping Ads carousel. I was able to replicate this, where for some images, Google thinks a light gray background works better than a white background. This is not tiled, where every other result is shaded, it is based on some other algorithm, maybe the color of the photo of the product?

Here is a screenshot of this:

Saad AK shared videos of this on Twitter:

Example 2:

Sending to: @rustybrick SIR. pic.twitter.com/WwaBeFStCQ

— Saad AK (@SaadAlikhan1994) June 27, 2022

I am not sure if this is new or not but maybe it is?

Forum discussion at Twitter.