SEMRush shared a screen shot of a Google Product Listing Ads unit that has with it an organic snippet listing right below it. It is unusual, might be a bug, might be some sort of Google user interface test. I just wanted to share this with you all.
This is the image SEMRush shared with me on Twitter:
I personally cannot replicate this, which makes sense - since it doesn't look like something Google would launch. I am suspecting this is some sort of user interface bug.
Forum discussion at Twitter.