I believe generally when you search Bing and get a Copilot answer at the top, Bing will just immediately show you the answer. Now, Microsoft is testing an animated response where Bing writes out the answer like a chatbot. This change was spotted by Sachin Patel who posted a couple of video examples on X - I was able to replicate it myself, here is my video as a GIF:
Microsoft is testing a new search bar/box header for the Bing Search results. The Bing search bar sticks to the top as you scroll through the search results. Google just rolled that out a month or so ago and now Bing is testing it. I spotted this via Sachin Patel, who noted the line divider between the search bar and the results, which may be new. He posted about it on X - but it seems the sticky search bar is a test too.
There are several posts in the Search Central Forum about this, and I just saw the issue pop up for a client. Google's Crawl Stats reporting drops heavily around 8/8. There is no impact to rankings and traffic, but all the sites posting about this see it happen on 8/8. My client is not blocking crawling of Googlebot, and Bing seems totally fine crawling-wise.