Container does not scale down to 0 with ASB queues

Please provide us with the following information:

This issue is a: (mark with an x)

[ x] bug report -> please search issues before submitting
[ ] documentation issue or request
[ ] regression (a behavior that used to work and stopped in a new release)

Issue description

I have a .NET 8.0 console application in a container, which is deployed to ACR and run on ContainerApps. Application is built on MassTransit, uses Azure Service Bus queues. It works great, but I always have one active replica running even there are no requests at all.

I tried it both ways with having my scaling rules with queue and connection, no change at all.

Unlike #952, I have no key-vault references, my secrets are Container Apps Secrets.

Here's the JSON of my resource:

{
    "id": "<redacted>",
    "name": "<redacted>",
    "type": "Microsoft.App/containerApps",
    "location": "West Europe",
    "tags": {
        "created_by": "cdktf",
        "environment": "Staging"
    },
    "systemData": {
        "createdBy": "1a6afc85-d01a-45ad-8de2-4aa26f74828d",
        "createdByType": "Application",
        "createdAt": "2023-12-12T10:39:02.4044595",
        "lastModifiedBy": "1a6afc85-d01a-45ad-8de2-4aa26f74828d",
        "lastModifiedByType": "Application",
        "lastModifiedAt": "2023-12-19T07:47:57.7108815"
    },
    "properties": {
        "provisioningState": "Succeeded",
        "runningStatus": "Running",
        "managedEnvironmentId": "<redacted>",
        "environmentId": "<redacted>",
        "workloadProfileName": null,
        "outboundIpAddresses": [
            "<redacted>"
        ],
        "latestRevisionName": "<redacted>--8psntt0",
        "latestReadyRevisionName": "<redacted>--8psntt0",
        "latestRevisionFqdn": "",
        "customDomainVerificationId": "<redacted>",
        "configuration": {
            "secrets": [
                {
                    "name": "container-registry-admin-password"
                },
                {
                    "name": "servicebus"
                }
            ],
            "activeRevisionsMode": "Single",
            "ingress": null,
            "registries": [
                {
                    "server": "<redacted>",
                    "username": "<redacted>",
                    "passwordSecretRef": "container-registry-admin-password",
                    "identity": ""
                }
            ],
            "dapr": null,
            "maxInactiveRevisions": null,
            "service": null
        },
        "template": {
            "revisionSuffix": "",
            "terminationGracePeriodSeconds": null,
            "containers": [
                {
                    "image": "<redacted>",
                    "name": "processor",
                    "args": [
                        "dotnet",
                        "Processor.dll"
                    ],
                    "env": [
                        {
                            "name": "DOTNET_ENVIRONMENT",
                            "value": "Staging"
                        }
                    ],
                    "resources": {
                        "cpu": 1,
                        "memory": "2Gi",
                        "ephemeralStorage": "4Gi"
                    },
                    "probes": []
                }
            ],
            "initContainers": null,
            "scale": {
                "minReplicas": null,
                "maxReplicas": 5,
                "rules": [
                    {
                        "name": "order-accepted",
                        "azureQueue": {
                            "queueName": "order-accepted",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "order-fulfilled",
                        "azureQueue": {
                            "queueName": "order-fulfilled",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "order-rejected",
                        "azureQueue": {
                            "queueName": "order-rejected",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "order-state",
                        "azureQueue": {
                            "queueName": "order-state",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "process-order",
                        "azureQueue": {
                            "queueName": "process-order",
                            "queueLength": 5,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "submit-order",
                        "azureQueue": {
                            "queueName": "submit-order",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    },
                    {
                        "name": "validation",
                        "azureQueue": {
                            "queueName": "validation",
                            "queueLength": 10,
                            "auth": [
                                {
                                    "secretRef": "servicebus",
                                    "triggerParameter": "connection"
                                }
                            ]
                        }
                    }
                ]
            },
            "volumes": [],
            "serviceBinds": null
        },
        "eventStreamEndpoint": "<redacted>"
    },
    "identity": {
        "type": "None"
    }
}

Steps to reproduce

Expected behavior [What you expected to happen.] Container replicas scaling down to 0 after cool down period

Actual behavior [What actually happened.] 1 container is always up

Screenshots
If applicable, add screenshots to help explain your problem. 7+ minutes in, container is still alive.

Additional context

Ex. Did this issue occur in the CLI or the Portal? Portal

microsoft / azure-container-apps