As far as I know I am not using NetworkManager, 'nmcli dev' shows the
following:

DEVICE  TYPE      STATE       CONNECTION 
virbr0  bridge    nem kezelt  --         
vm-br0  bridge    nem kezelt  --         
lan     ethernet  nem kezelt  --         
lo      loopback  nem kezelt  --         
iscsi   vlan      nem kezelt  --         
vm      vlan      nem kezelt  --

('nem kezelt' means not managed; the 'iscsi' interface is a statically
configured vlan device to access the VM storage backend)

My usecase is somewhat special as I use the desktop distribution with a
somewhat more complicated setup than usual because I need to use
networked VMs for my work. I am using networkd as I thought it would be
more appropriate than NetworkManager.

Upon further investigation to the original matter I believe it is really
an issue with systemd-resolved instead of netplan, so sorry for taking
your time. My local router resolves hostnames differently for the host
and the VM networks. After startup or issuing a 'netplan apply' after
resume the resolver for the host ('lan' network) is being used as
primary, BUT after resume not issuing a 'netplan apply' command somehow
the resolver for the VM network takes precedence - which is bad. Then
the host will obviously try to access the 'misresolved' systems through
the wrong gateway, which is really only the symptom not the cause.

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https://bugs.launchpad.net/bugs/2060778

Title:
  netplan, multiple dhcp route with metric failure

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