(You may avoid URLs being converted to links (and hitting the link limit thus) by applying </> Preformatted text from the menu. I've edited your post accordingly.) 
If your search has indeed been for the full URL, it would always return zero hits.
As a domain blocker, Pi-hole is aware of domains only, not URLs.
Blocking lists for Pi-hole have to conform to HOSTS format, containing only domains or domain to IP associations.
You may use Pi-hole's search utility via Tools | Query Lists to find out which blocklists contain a given domain.
From your description, it is not entirely clear what your issue is.
What webpage are you referring to?
According to your debug log, your network has IPv6 connectivity.
Did you cater for IPv6 as well?
Try to avoid using Pi-hole's public IPv6 address when doing so. Pi-hole is not meant to be publically available, and with a public IPv6, both your IPv6 prefix and the interface identifier are subject to change (the former by your ISP, the latter by IPv6 Privacy Extensions and the likes), and Pi-hole requires a stable address.
Instead of providing mock answers, you could also consider to disable active probing on Windows altogether. Note that machines with multiple network interfaces may sometimes also fail on Windows passive network probing (for further information on Windows active/passive probing, see Windows 10 wifi - internet connectivity keeps dropping ).