DNS over HTTPS will prevent clients in your network from using the default local DNS services. Mozilla Firefox has a feature to disable DOH network wide for all clients as described here. Add the following line to your dnsmasq.conf to disable DOH on all local clients
address=/use-application-dns.net/

For a Pi-hole setup
Because Pi-hole does not fully support loading of dnsmasq domain filters (details here), you should add your own .conf file in /etc/dnsmasq.d/. This way you can still use our blocklists with Pi-hole, but updating has to be done by an external daily cronjob. It's also recommended to remove all default Pi-hole lists, since these are already included in our list in a more efficient manner.