Comment 11 for bug 1771353

I'm see this just trying to resolve names on my local LAN:

Aug 02 17:50:40 beelink systemd-resolved[6697]: Processing incoming packet on transaction 52812. (rcode=SUCCESS)
Aug 02 17:50:40 beelink systemd-resolved[6697]: Server doesn't support EDNS(0) properly, downgrading feature level...
Aug 02 17:50:40 beelink systemd-resolved[6697]: Using degraded feature set (UDP) for DNS server 192.168.128.32.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Server feature level is now lower than when we began our transaction. Restarting with new ID.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 52812 is now 18875.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Cache miss for xu-host.lan IN AAAA
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 18875 for <xu-host.lan IN AAAA> scope dns on lan0/*.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Using feature level UDP+EDNS0 for transaction 18875.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Sending query packet with id 18875.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Processing incoming packet on transaction 18875. (rcode=SUCCESS)
Aug 02 17:50:40 beelink systemd-resolved[6697]: Server feature level is now lower than when we began our transaction. Restarting with new ID.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 18875 is now 44944.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Cache miss for xu-host.lan IN AAAA
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 44944 for <xu-host.lan IN AAAA> scope dns on lan0/*.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Using feature level UDP+EDNS0 for transaction 44944.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Sending query packet with id 44944.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Processing incoming packet on transaction 44944. (rcode=SUCCESS)
Aug 02 17:50:40 beelink systemd-resolved[6697]: Server feature level is now lower than when we began our transaction. Restarting with new ID.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 44944 is now 42801.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Cache miss for xu-host.lan IN AAAA
Aug 02 17:50:40 beelink systemd-resolved[6697]: Transaction 42801 for <xu-host.lan IN AAAA> scope dns on lan0/*.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Using feature level UDP+EDNS0 for transaction 42801.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Sending query packet with id 42801.
Aug 02 17:50:40 beelink systemd-resolved[6697]: Processing incoming packet on transaction 42801. (rcode=SUCCESS)
Aug 02 17:50:40 beelink systemd-resolved[6697]: Server feature level is now lower than when we began our transaction. Restarting with new ID.

Upstream DNS is a probably fairly ancient version of dnsmasq..