New Router Firmware, Now Ads show up

I recently updated the my AsusWRT_Merlin firmware to the 3006 release and reinstalled/upgraded to the latest NextDNS.io CLI, and found ads are beginning to get through.

I'm assuming there might be an incompatibility with this firmware, because the logs don't look any different than how they've been. Unless there are somehow coincidentally new ad networks showing up that NextDNS isn't aware of, I don't know how to explain this. 

Help?