This is what I see:
This test was spotted by Len Raleigh on Twitter, he shared this screenshot:
Here are more images:
Google is testing showing two local service ads in a list view, a change from it showing three local service ads in a carousel format. Google actually switched to three LSAs a year or so ago, up from two, and is now back to testing two.
Forum discussion at Twitter.
It was probably Google testing, as no one can replicate this the following days.
— Len (@lenraleigh) August 7, 2023