Upon node restart NetworkManager fails to activate br-ex interface. Bond has been configured using NMState operator.

OCP 4.12 with RHEL 8.6 worker nodes

Upon node reboot

1. Created bond using ens1f0 + ens1f1 = bond0 
2. Reboot the node.
3. Below visible on affected node.

[root@bl9261 ticams003]# ll /etc/sysconfig/network-scripts/*
-rw-r--r--. 1 root root 347 May  8 13:54 /etc/sysconfig/network-scripts/ifcfg-bond0
-rw-r--r--. 1 root root 453 Jun  2 16:03 /etc/sysconfig/network-scripts/ifcfg-bond0.3200
-rw-r--r--. 1 root root 146 May  8 13:54 /etc/sysconfig/network-scripts/ifcfg-ens1f0
-rw-r--r--. 1 root root 146 May  8 13:54 /etc/sysconfig/network-scripts/ifcfg-ens1f1 

Below is visible in boot logs 
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3619] device (br-ex): state change: deactivating -> unmanaged (reason 'removed', sys-iface-state: 'managed')
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3625] device (bond0.3200): state change: activated -> deactivating (reason 'unmanaged', sys-iface-state: 'managed')
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3648] device (bond0.3200): state change: deactivating -> unmanaged (reason 'removed', sys-iface-state: 'managed')
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3652] device (br-ex): state change: activated -> deactivating (reason 'unmanaged', sys-iface-state: 'managed')
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3663] device (br-ex): state change: deactivating -> unmanaged (reason 'removed', sys-iface-state: 'managed')
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3663] device (br-ex): detaching ovs interface br-ex
Aug 25 12:09:44 bl9263 NetworkManager[3388]: <info>  [1692965384.3673] device (br-ex): state change: activated -> deactivating (reason 'unmanaged', sys-iface-state: 'managed')

Node networking being normal as br-ex gets activated.

As a workaround restarting NetworkManager helps get the br-ex interface back & node network is back again.