Apologies for replying to an old thread, but at the same time I didn't want to create a new post for such a similar topic. We are more frequently seeing variations of 3-pack results, similar to what
@SEO_Ron had initially reported. It seems to be easily reproduced with certain Business Categories, but unlike the "limo" search, most of the info is showing on the listing except for the star rating.
For example, if you perform a desktop search for "banks near me" or "banks in city-name" you'll get the A, B, C listing. The same applies for "pharmacy near me" and "pharmacy in city-name". This is regardless of whether they are branded or non-branded banks/pharmacy. Likewise, I was able to replicate this using Google Anonymous Preview Tool.
When searching for "grocery near me" or "grocery in city-name", a similar result shows up, but instead of A,B,C, a square image of the location is shown, again with no star rating.
Curious if any of the GBP experts have any feedback that Google has shared in regards to what categories result in non-typical 3-pack listings? Is this possibly a glitch related to the previous Covid "sensitive" categories? However, unlike missing reviews or no reviews showing for those previous covid sensitive business categories, if you click on a business in the 3-pack in the above mentioned searches, you can see the reviews which usually include new reviews.