[BUG??] Webhook result variable not updating

[BasilG]

I have an issue where the variable of the webhook result does not update for some reason.

First Scenario:
Enters valid customer ID > call webhook > save result on a variable > route to extract pin   ----- working as intended.
Logs as follows:

        "Step 3": {
          "FunctionExecution": {
            "SessionParameters(Updated)": {
              "customer_id_response": 566099108
            },
            "Webhook": {
              "Unauthorized FulfillmentResponse": false,
              "URL": "https://redacteddomain.com/routing-service/customer/566099108",
              "DisplayName": "verify customer id",
              "Status": "OK",
              "Tag": "check customer",
              "ID": "50f24f9a-4837-4c09-9f34-5a74d6e02831",
              "Latency": "654 ms"
            }
          },
          "Type": "STATE_MACHINE",
          "StateMachine": {
            "FlowState": {
              "Version": 0,
              "Name": "Customer Status",
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "PageState": {
                "Status": "ENTERING_PAGE",
                "PageId": "39599d86-a748-41dd-8d57-35f231f39a70",
                "Name": "verify customer id"
              }
            }
          }
        }

Second Scenario: (not working as designed)
Enters wrong customer ID > call webhook > null response > Ask to try again > Yes > Enter right customer ID > call webhook > OK (based on the logs) > Not updating the response variable for some reason? (based on the logs) > Fails to route

Logs as follows:

    "Execution Sequence": [
      {
        "Step 1": {
          "Type": "INITIAL_STATE",
          "InitialState": {
            "SessionParameters": {
              "tryagain": "yes",
              "customer_id_response": null,
              "customer_id": null,
              "number-sequence": "566099108"
            },
            "FlowState": {
              "PageState": {
                "PageId": "74f79a67-e610-470f-b85e-2dad6a43bc75",
                "Status": "TRANSITION_ROUTING",
                "FormFilled": true,
                "Name": "ask customer id again"
              },
              "Name": "Customer Status",
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "Version": 0
            },
            "MatchedIntent": {
              "Id": "8ead0eb6-0861-4731-a349-218386e5ba1a",
              "Parameters": {
                "number-sequence": {
                  "type": "@sys.number-sequence",
                  "original": "566099108",
                  "resolved": "566099108"
                }
              },
              "Score": 1,
              "DisplayName": "Customer ID",
              "Active": true,
              "Type": "NLU"
            }
          }
        }
      },
      {
        "Step 2": {
          "StateMachine": {
            "TriggeredIntent": "Customer ID",
            "TriggeredTransitionRouteId": "e68f6676-4b09-4384-bc8b-137d3255c337",
            "TargetPage": "39599d86-a748-41dd-8d57-35f231f39a70",
            "FlowState": {
              "PageState": {
                "PageId": "74f79a67-e610-470f-b85e-2dad6a43bc75",
                "Status": "TRANSITION_ROUTING",
                "Name": "ask customer id again",
                "FormFilled": true
              },
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "Name": "Customer Status",
              "Version": 0
            }
          },
          "FunctionExecution": {
            "SystemFunctionResults": {
              "$sys.func.TO_NUMBER": [
                566099108
              ]
            },
            "SessionParameters(Updated)": {
              "customer_id": 566099108
            }
          },
          "Type": "STATE_MACHINE"
        }
      },
      {
        "Step 3": {
          "StateMachine": {
            "FlowState": {
              "Name": "Customer Status",
              "PageState": {
                "PageId": "39599d86-a748-41dd-8d57-35f231f39a70",
                "Status": "ENTERING_PAGE",
                "Name": "verify customer id"
              },
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "Version": 0
            }
          },
          "Type": "STATE_MACHINE",
          "FunctionExecution": {
            "Webhook": {
              "Status": "OK",
              "URL": "https://redacteddomain.com/routing-service/customer/566099108",
              "ID": "50f24f9a-4837-4c09-9f34-5a74d6e02831",
              "DisplayName": "verify customer id",
              "Unauthorized FulfillmentResponse": false,
              "Latency": "682 ms",
              "Tag": "check customer"
            }
          }
        }
      },
      {
        "Step 4": {
          "Type": "STATE_MACHINE",
          "StateMachine": {
            "FlowState": {
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "Version": 0,
              "PageState": {
                "Name": "verify customer id",
                "PageId": "39599d86-a748-41dd-8d57-35f231f39a70",
                "Status": "TRANSITION_ROUTING",
                "FormFilled": true
              },
              "Name": "Customer Status"
            },
            "TriggeredCondition": "$session.params.customer_id_response = null",
            "TriggeredTransitionRouteId": "a08898ff-5b8b-476c-9dbf-a8156c211104",
            "TargetPage": "5551c61c-6167-4331-9243-5abf17dfcdf6"
          },
          "FunctionExecution": {
            "SessionParameters(Updated)": {
              "customer_id": null,
              "number-sequence": null
            },
            "Responses": [
              {
                "responseType": "HANDLER_PROMPT",
                "text": {
                  "text": [
                    "We can't verify the account."
                  ]
                },
                "source": "VIRTUAL_AGENT"
              }
            ]
          }
        }
      },
      {
        "Step 5": {
          "Type": "STATE_MACHINE",
          "FunctionExecution": {
            "Responses": [
              {
                "text": {
                  "text": [
                    "Do you want to try again?"
                  ]
                },
                "responseType": "ENTRY_PROMPT",
                "source": "VIRTUAL_AGENT"
              }
            ]
          },
          "StateMachine": {
            "FlowState": {
              "Name": "Customer Status",
              "Version": 0,
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "PageState": {
                "Status": "ENTERING_PAGE",
                "Name": "try again for customer id",
                "PageId": "5551c61c-6167-4331-9243-5abf17dfcdf6"
              }
            }
          }
        }
      },
      {
        "Step 6": {
          "StateMachine": {
            "FlowState": {
              "Version": 0,
              "FlowId": "3231670c-709f-4953-bc57-373d9b214ad3",
              "Name": "Customer Status",
              "PageState": {
                "FormFilled": true,
                "Name": "try again for customer id",
                "PageId": "5551c61c-6167-4331-9243-5abf17dfcdf6",
                "Status": "TRANSITION_ROUTING"
              }
            }
          },
          "Type": "STATE_MACHINE"
        }
      }
    ],

As you can see on the secondary log. It does not have value for customer_id_response which set after the API call.

Ref#
"FunctionExecution": {
"SessionParameters(Updated)": {
"customer_id_response": 566099108
},

the variable $session.params.customer_id_response is the variable set for webhook response configuration

I have checked everything and it seems like a bug at this point.

Any insight for this issue would be much appreciated. 

anyone was able to solve this?

Tagging top contributor @a_aleinikov  for visibility