Dave DiGregorio posted screen shots of content from a local business's Google Posts content showing up in the local listings, including the local knowledge panel and local pack listings. This gives more exposure to the Google Posts content and possibly the listing.
He posted these screen shots of this on Twitter:
It is unclear exactly how to trigger this. It might be a limited test. It might be only if you follow the business. It might be query dependent or it might be all of the above.
Interesting nevertheless.
Forum discussion at Twitter.