Might be the Mullvad DNS. Try toggling it off and on again
Discussion
🤙 Had also just found this out on Telegram.
Does it have anything to do with DNSSEC? It was running for a while. Then suddenly it stopped.
Or nostr:npub168euw93e4cam59llcmydav0akwjk2p4nfy3p85pn22xv9y2jxuzq4s9uaw has changed something.
Im not using the app or their DNS, im using PiHole