DNS leaking when using iCloud Private Relay with LuLu Firewall

[FelixOnAMission]

I'm using MacOS Monterey 12.6 with iCloud Private Relay enabled. It works fine, as far as I can tell. But when I do a DNS test (in Safari) on "https://browserleaks.com/ip" it shows the DNS of Private Relay as well as the quad9 DNS I set up on my router (picture attached). Once I turn off LuLu the DNS test only shows the DNS of Private Relay.