I have observed this, but also found that BingBot modifies the query string parameters of your URL. It does this by changing a character of the URL, possibly in an attempt to find new pages?

I noticed this because I generate links with a signed token to ensure integrity and started receving invalid token crash reports in Sentry, always from BingBot..

To fix this I had to move the tokens from the query string into the URL itself to avoid BingBot changing it. eg.

http://mysite.io/do-action?token=shvgaaehr2rnyxhh-391-1 to http://mysite.io/do-action/shvgaaehr2rnyxhh-391-1/

Anyone else noticed this?