"scaleLevel" is not changed after the LCM rollback operation

I tried the scale out operation with a MgmtDriver in the tacker stable/wallaby releases, the scale out operation was failed.It's a created VNF Package issue by myself, so it's not a problem for the scale out operation to fail.However, a scaleLevel in the scaleStatus was "1" not "0".

---
$ openstack vnflcm scale --type SCALE_OUT --aspect-id free5gc_instance 0126ede2-84f4-4e18-996f-93cb68455945
Scale request for VNF Instance 0126ede2-84f4-4e18-996f-93cb68455945 has been accepted.
$
$ openstack vnflcm op list
+--------------------------------------+-----------------+--------------------------------------+-------------+
| ID | Operation State | VNF Instance ID | Operation |
+--------------------------------------+-----------------+--------------------------------------+-------------+
| 3dc2583e-479b-4b3f-ae8d-c5ebeea46c40 | FAILED_TEMP | 0126ede2-84f4-4e18-996f-93cb68455945 | SCALE |
+--------------------------------------+-----------------+--------------------------------------+-------------+
$
$ openstack vnflcm show 0126ede2-84f4-4e18-996f-93cb68455945 --fit-width
+--------------------------+-----------------------------------------------------------------------------------
| Field | Value
+--------------------------+-----------------------------------------------------------------------------------
| ID | 0126ede2-84f4-4e18-996f-93cb68455945
| Instantiated Vnf Info | {
| | "flavourId": "simple",
| | "vnfState": "STARTED",
| | "scaleStatus": [
| | {
| | "aspectId": "free5gc_instance",
| | "scaleLevel": 1 *
| | }
| | ],
---

And then, run the rollback operation, but the scaleLevel of scaleStatus remains at "1" and does not change to "0".

---
$ openstack vnflcm op rollback 3dc2583e-479b-4b3f-ae8d-c5ebeea46c40
Rollback request for LCM operation 3dc2583e-479b-4b3f-ae8d-c5ebeea46c40 has been accepted
$
$ openstack vnflcm op list
+--------------------------------------+-----------------+--------------------------------------+-------------+
| ID | Operation State | VNF Instance ID | Operation |
+--------------------------------------+-----------------+--------------------------------------+-------------+
| 3dc2583e-479b-4b3f-ae8d-c5ebeea46c40 | ROLLED_BACK | 0126ede2-84f4-4e18-996f-93cb68455945 | SCALE |
+--------------------------------------+-----------------+--------------------------------------+-------------+
$
$ openstack vnflcm show 0126ede2-84f4-4e18-996f-93cb68455945 --fit-width
+--------------------------+-----------------------------------------------------------------------------------
| Field | Value
+--------------------------+-----------------------------------------------------------------------------------
| ID | 0126ede2-84f4-4e18-996f-93cb68455945
| Instantiated Vnf Info | {
| | "flavourId": "simple",
| | "vnfState": "STARTED",
| | "scaleStatus": [
| | {
| | "aspectId": "free5gc_instance",
| | "scaleLevel": 1 *
| | }
| | ],
---

Therefore, retry the scale out operation with this status does not run.

---
$ openstack vnflcm scale --type SCALE_OUT --aspect-id free5gc_instance 0126ede2-84f4-4e18-996f-93cb68455945
can not scale_out
$
---