What were you trying to do that didn't work?

When configuring ipv6 link local dns on a disconnected (nmcli dev show) interface, even there is an ipv6 address on the interface, nmstate always raises "NmstateError: InvalidArgument: Interface veth0 has IPv6 disabled, hence cannot hold desired IPv6 link local DNS server fe80::deef:1%veth0"

This action works well in nmstate-2.2.48, nmstate can apply DNS successfully and take control the interface

What is the impact of this issue to you?

Cannot simply apply ipv6 link local DNS setting only, without setting target interface "state: up" in the desired state

Please provide the package NVR for which the bug is seen:

nmstate-2.2.50-1.el9.x86_64
NetworkManager-1.54.0-1.el9.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

ip link add veth1 type veth peer veth1_ep
ip link set veth1 up
ip link set veth1_ep up
sleep 1
nmcli dev set veth1 managed yes
if ! ip -6 addr show veth1 | grep veth1; then
  echo 0 > /proc/sys/net/ipv6/conf/veth1/disable_ipv6
  echo 0 > /proc/sys/net/ipv6/conf/veth1/addr_gen_mode
fi
# confirm veth1 has ipv6 address and is disconnected in NM
ip -6 addr show veth1
nmcli dev
echo '
dns-resolver:
  config:
    search:
      - redhat.com
      - usersys.redhat.com
    server:
      - 10.72.17.5
      - 8.8.8.8
      - ae86:3200:baba::1
      - fe80::deef:1%veth0
' | nmstatectl apply

Expected results

The DNS configured

Actual results

NmstateError: InvalidArgument: Interface veth0 has IPv6 disabled, hence cannot hold desired IPv6 link local DNS server fe80::deef:1%veth0

If veth0 is already connected in NM, or append

interfaces: 
- name: veth0
  state: up

into the desired state, the apply works