Google seems to be testing a "posts from" section in the search results. Very much like the popular on Twitter (now X) section but this includes not just posts from X but also Instagram, YouTube and other social networks.
Punit spotted this feature and posted about it on Mastodon. I personally cannot replicate this, so it seems like a test to me. Here are screenshots:
Do you see it?
Do you like it?
Forum discussion at Mastodon.