Check if lowercase URL is valid before modifying
When the "Robot" creates an excerpt, it converts the URL to lowercase. However, some URLs are case-sensitive, at Wikipedia for example. I ran into (and fixed, I think) a broken Wikipedia link due to this.
I suggest fixing "Robot" to verify that a lowercase URL points to the same content as the original URL before using the lowercase version as a reference.
Also, I tried submitting this directly through the "Feedback about Bing Distill" form and got an error submitting.