why newly created flavor do not appear in `nova flavor-list` command ?

Issue

• If anyone create private flavor then, it do not appear in "nova flavor-list" command but, it appears if we pass "--all" flag with the command. Also, we cant use flavor name while creating instance but, it accepts the flavor ID.

[root@controller ~(keystone_admin)]# nova flavor-create --is-public False test1234 21 2048 20 1
+----+----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name     | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+----------+-----------+------+-----------+------+-------+-------------+-----------+
| 21 | test1234 | 2048      | 20   | 0         |      | 1     | 1.0         | False     |
+----+----------+-----------+------+-----------+------+-------+-------------+-----------+

[root@controller ~(keystone_admin)]# nova flavor-list
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| ID                                   | Name          | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| 1                                    | m1.tiny       | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 2                                    | m1.small      | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 3                                    | m1.medium     | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 39914232-72dc-4904-a4bc-8b58a7f8bf68 | pbandark_test | 1024      | 50   | 2         | 500  | 1     | 1.0         | False     |
| 4                                    | m1.large      | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5                                    | m1.xlarge     | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+


But, "test1234" flavor appears if we pass "--all" flag with "nova flavor-list" command.

[root@controller ~(keystone_admin)]# nova flavor-list --all
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| ID                                   | Name          | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| 1                                    | m1.tiny       | 512       | 1    | 0         |      | 1     | 1.0         | True      |
| 2                                    | m1.small      | 2048      | 20   | 0         |      | 1     | 1.0         | True      |
| 21                                   | test1234      | 2048      | 20   | 0         |      | 1     | 1.0         | False     |  <======
| 3                                    | m1.medium     | 4096      | 40   | 0         |      | 2     | 1.0         | True      |
| 39914232-72dc-4904-a4bc-8b58a7f8bf68 | pbandark_test | 1024      | 50   | 2         | 500  | 1     | 1.0         | False     |
| 4                                    | m1.large      | 8192      | 80   | 0         |      | 4     | 1.0         | True      |
| 5                                    | m1.xlarge     | 16384     | 160  | 0         |      | 8     | 1.0         | True      |
+--------------------------------------+---------------+-----------+------+-----------+------+-------+-------------+-----------+
====
If we try to create any instance using flavor Name:

[root@controller ~(keystone_admin)]# nova boot --flavor test1234 --image cb272dd7-a9a8-41ab-bf25-5f791acc60e7 test_vm
ERROR: No flavor with a name or ID of 'test1234' exists.

Operation is successful if we create instance using flavor ID:

[root@controller ~(keystone_admin)]# nova boot --flavor 21 --image cb272dd7-a9a8-41ab-bf25-5f791acc60e7 --nic  net-id=2190cc4c-e837-4a50-b207-81d68b7d15b8 test_vm 
+--------------------------------------+--------------------------------------+
| Property                             | Value                                |
+--------------------------------------+--------------------------------------+
| OS-EXT-STS:task_state                | scheduling                           |
| image                                | RHEL                                 |
| OS-EXT-STS:vm_state                  | building                             |
[...]