Apple Profile DoH URL blocking traffic from home network

Hello,

I've used the Apple Config profile on my iOS devices for years, it's enabled all the time. Starting this morning, apple.dns.nextdns.io will not respond to any traffic from my home network/ISP address and DNS resolution fails on my phone & iPad.

Troubleshooting steps so far:

1. Checked basic resolution:

   % host apple.dns.nextdns.io

   apple.dns.nextdns.io is an alias for steering.nextdns.io.

   steering.nextdns.io has address 208.89.60.14

   steering.nextdns.io has address 45.91.248.165

2. Checked firewall logs - traffic to 208.89.60.14 & 45.91.248.165 is allowed and passing

3. Disabled wifi - DNS resolution immediately works on cellular. Confirmed through my.nextdns.io on device that NextDNS resolvers are being used

4. Attempt to load apple.dns.nextdns.io from PC on home network - page hangs, Wireshark shows continued TCP retransmissions, remote host never responds.

5. Attempt to load apple.dns.nextdns.io from PC on another network - page resolves

Is anyone else seeing similar behavior? Can someone from support check if there's some auto-rule that started blocking traffic on the steering IPs? I can provide my public/egress IP in a DM or ticket.