On my Ubuntu box it's sometimes necessary to flush the DNS cache from the system also with systemd-resolve for changes in DNS entries to take immediate effect. I'm assuming you're using Windows, so maybe that has something similar?
Fedora 29 here, FWIW. I'll look to see if they config systemd similarly.
@meerkt, nope, router just moves packets, it doesn't do any filtering other than dropping incoming connection requests. No pi-hole like stuff at all.
I'll try flushing the system level DNS and see if that helps.
Nope, that didn't do it. *sigh* I'm waiting for my forum membership over there to get out of moderation. Once it does, I'll ask them if there's something it might be.