To Reproduce Steps to reproduce the behaviour:

1. Create the ports
2. Create bulk of instances

3. for i in {51..80}
   do
       PORT_ID=$(openstack port create --fixed-ip subnet=5701893a-c4a1-4e8a-88e0-f42e2b2bcddf --network b624f4a5-d2ac-4df0-8904-6485167edae1 testport --insecure -f value -c id);
       openstack server create hrishiubuntu-vm-22092025-$i --wait --boot-from-volume 100 --flavor m1.medium --image 1c83e27d-67af-481e-aab6-145d37564bdd --nic "port-id=$PORT_ID" --insecure;
   done

1. Sometimes one or more instances fail on:

2. | fault                               | {'code': 500, 'created': '2025-09-19T18:30:02Z', 'message': "Exceeded maximum number of retries. |
   |                                     | Exceeded max scheduling attempts 3 for instance 90d2b0cf-4d27-44f7-9ffe-f59b8272abbf. Last       |
   |                                     | exception: Bad port request: A virtual logical switch port cannot be bound to a host.\nNeutron   |
   |                                     | server returns request_ids: ['req-", 'details': 'Traceback (most recent call last):\n  File      |
   |                                     | "/usr/lib/python3.9/site-packages/nova/conductor/manager.py", line 690, in build_instances\n     |
   |                                     | scheduler_utils.populate_retry(\n  File "/usr/lib/python3.9/site-                                |
   |                                     | packages/nova/scheduler/utils.py", line 998, in populate_retry\n    raise                        |
   |                                     | exception.MaxRetriesExceeded(reason=msg)\nnova.exception.MaxRetriesExceeded: Exceeded maximum    |
   |                                     | number of retries. Exceeded max scheduling attempts 3 for instance                               |
   |                                     | 90d2b0cf-4d27-44f7-9ffe-f59b8272abbf. Last exception: Bad port request: A virtual logical switch |
   |                                     | port cannot be bound to a host.\nNeutron server returns request_ids:                             | 

1. It seems bound to only to specific network
2. If they try to use the same port to a new instance is working.

Expected behavior

• all instances should be created

Device Info (please complete the following information):

• OSP operator version: 1.0.12
  OPENSTACK_RELEASE_VERSION: 18.0.10-20250708.1

Bug impact

• Customer is blocked on testing and bring in production the new env

Additional context

• must-gather on case 04259810 must-gather.local.1827295352321786304.tar.gz
• ovn db on case 04259810
• instance and port information on case https://access.redhat.com/support/cases/#/case/04259810?commentId=a0aHn00000ZojWwIAJ