"Failed to load content" when inside a Pi-Hole Protected Network

The Query Log from Pi-Hole

Basically what the title says. Since recently, probably after one of the latest updates, Relay doesn't load any content in my home network, which is protected by a Pi-Hole. Switching to mobile data for authentication and then back to W-LAN solves the issue for a while but after a couple of hours/a day it's blocked again.

I know I could just whitelist the domains but I'm wondering if this is intended or indeed unwanted behaviour.