Trouble with Apple Private Relay since upgrading to 26.7.x

[tonys]

I'm having issues with my iPhones reporting "Privacy Warning" and/or "internet not connected" errors since upgrading to 26.7. I applied the 26.7.1 patch today but the problems persist. Google AI is reporting that Apple's Private Relay is being temporarily blocked or getting slow access via Unbound DNS which causes iOS to timeout and issue these errors. I've tried a lot of different tests suggested by Google AI but I can't solve this issue. I don't know why DNS requests to Quad9 are getting stalled when they come through any device running Private Relay. This didn't happen under OPNSense 21.x.

I've also noticed slow updates on the OPNSense web page when going through the various settings. OPNSense is accessed from my Mac via Private Relay under Safari as well so this further indicates the problem is between Private Relay and Unbound DNS. It sometimes takes more than a full minute to update the OPNSense GUI whenever I switch to a different settings page if the new page hasn't been cached already.

I'm current using both AdGuard and Stevens Blacklist lists with the Normal relaxed/balanced blocking level setting.