The issue I am facing:
In HTTPS://RAW.GITHUBUSERCONTENT.COM/STEVENBLACK/HOSTS/MASTER/HOSTS
This address is commented out by default: # 0.0.0.0 cdn.jsdelivr.net #[affects spireenergy.com]
But pihole just started blocking it, once I whitelisted it issues were resolved.
Details about my system:
What I have changed since installing Pi-hole:
I believe this started after the last pihole patch which happened about a week ago which lines up with this, but I could be wrong.