As everyone is aware that BingBot is going evergreen and also updating with a new user agent. The new user agent will going to be dynamic depending on the version of the browser. A version of browsing is used to crawl the user websites.
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New User-Agent Format
Similar To Google
Bing is also trying to copy Google by adding plugin the version to the number of browsers. Google is handling it very well and which is rolling out now as well.