No reproduced with contrail packages 3.0.2.0-25:

root@node-34:~# neutron net-list
+--------------------------------------+---------------------------------------------------------------------------------------------+-------------------------------------------------------+
| id                                   | name                                                                                        | subnets                                               |
+--------------------------------------+---------------------------------------------------------------------------------------------+-------------------------------------------------------+
| dc6646f8-8d06-4e37-b2f2-5492d79731c3 | net04                                                                                       | 66c337fb-0530-48aa-bd8d-256b1520b04a 192.168.111.0/24 |
| 34bba879-fc19-4db3-bed8-602198e72ba1 | default-virtual-network                                                                     |                                                       |
| 66c4ce9c-9cb6-4efd-ab99-4740d20ecdee | snat-si-left_snat_04ab879c-90b1-4bd7-a226-5dd95b0eb798_baad098a-09a4-4cc5-b41d-ecaff0ccc1fb | ab5e6353-0ecd-4482-911e-144079496015 100.64.0.0/29    |
| 60f87810-036c-4add-8d8e-d39a3f2b9cea | __link_local__                                                                              |                                                       |
| ea3f0a3c-b2b5-4094-bad3-96f833edeb6c | ip-fabric                                                                                   |                                                       |
| 2d60cc93-d221-4b95-af2d-47b083c14a02 | net04_ext                                                                                   | c218b650-be40-484d-9fec-822b1e3be1ae 10.100.1.0/24    |
+--------------------------------------+---------------------------------------------------------------------------------------------+-------------------------------------------------------+

root@node-34:~# neutron port-create net04_ext --fixed-ip ip_address=10.100.1.10
Created a new port:
+---------------------+------------------------------------------------------------------------------------+
| Field               | Value                                                                              |
+---------------------+------------------------------------------------------------------------------------+
| admin_state_up      | True                                                                               |
| binding:vif_details | {"port_filter": true}                                                              |
| binding:vif_type    | vrouter                                                                            |
| binding:vnic_type   | normal                                                                             |
| device_id           |                                                                                    |
| device_owner        |                                                                                    |
| fixed_ips           | {"subnet_id": "c218b650-be40-484d-9fec-822b1e3be1ae", "ip_address": "10.100.1.10"} |
| id                  | 7713ed1e-19a9-4c24-b095-f1960638df47                                               |
| mac_address         | 02:77:13:ed:1e:19                                                                  |
| name                | 7713ed1e-19a9-4c24-b095-f1960638df47                                               |
| network_id          | 2d60cc93-d221-4b95-af2d-47b083c14a02                                               |
| security_groups     | 06ecb0b7-80c3-4bcc-801e-0077f6941d22                                               |
| status              | DOWN                                                                               |
| tenant_id           | b7df0fb6c9614f1d867e3a1535e9df87                                                   |
+---------------------+------------------------------------------------------------------------------------+

root@node-34:~# neutron port-show 7713ed1e-19a9-4c24-b095-f1960638df47
+---------------------+------------------------------------------------------------------------------------+
| Field               | Value                                                                              |
+---------------------+------------------------------------------------------------------------------------+
| admin_state_up      | True                                                                               |
| binding:vif_details | {"port_filter": true}                                                              |
| binding:vif_type    | vrouter                                                                            |
| binding:vnic_type   | normal                                                                             |
| device_id           |                                                                                    |
| device_owner        |                                                                                    |
| fixed_ips           | {"subnet_id": "c218b650-be40-484d-9fec-822b1e3be1ae", "ip_address": "10.100.1.10"} |
| id                  | 7713ed1e-19a9-4c24-b095-f1960638df47                                               |
| mac_address         | 02:77:13:ed:1e:19                                                                  |
| name                | 7713ed1e-19a9-4c24-b095-f1960638df47                                               |
| network_id          | 2d60cc93-d221-4b95-af2d-47b083c14a02                                               |
| security_groups     | 06ecb0b7-80c3-4bcc-801e-0077f6941d22                                               |
| status              | DOWN                                                                               |
| tenant_id           | b7df0fb6c9614f1d867e3a1535e9df87                                                   |
+---------------------+------------------------------------------------------------------------------------+

Could be a bug in juniper contrail packages version 3.0.1.