Google is testing new "search results" feature within knowledge panels.
The feature is connected to the "their website mentions" local finder feature that was rolled out in September. The "Search Results" is only shown when local listing displays "their website mentions" in local finder, and highlights a page that mentions a searched term:
The new section is displayed below business's contact information and above local "Questions & Answers" section.
Here is what an expended local Knowledge Panel looks like with this test: