Description of problem: An OCP UPI deployment of 4.6.12 is deployed. During the deployment a bond0 interface is configured along with a vlan sub interface bond0.vlan1. The deployment process places OVN br-ex bridge on that interface. After deployment attempted to apply an NNCP policy (see attached) that creates a second vlan sub interface bond0.vlan2 and a linux bridge br-ext. The policy fails to apply and from the logs it appears the reason is that nmstates tries to do something with br-ex even though its not in the configuration. Logs and configuration attached.

Version-Release number of selected component (if applicable):
CNV 2.5.3
OCP 4.6.12
NAME="Red Hat Enterprise Linux CoreOS"
VERSION="46.82.202101131942-0"
VERSION_ID="4.6"
OPENSHIFT_VERSION="4.6"
RHEL_VERSION="8.2"

How reproducible:
Unsure - Marius was going to try to reproduce. Customer can reproduce all day long

Steps to Reproduce:
1.Install OCP via UPI with OVNKubernetes SDN
2.Install CNV
3.Attempt to apply NNCP policy

Actual results:
Policy fails to apply

Expected results:
Policy should apply

Additional info: