Azure app-service deployment center – what does the "Disconnect" do and how to "reconnect"?

I have an app-service that is hosting a FastAPI app in a container registry. The image below is the Settings page of the app-service’s Deployment Center in Azure.

I clicked on it to see all the options otherwise hidden and now I can’t undo it. It took about 20 seconds to process the "disconnect" command and, and although I AM deploying the app using Azure DevOps CICD pipelines, the "Azure Repos" connection is not restored.

The documentation doesn’t say much and the screenshots seem outdated. It says though that for Azure Pipelines there’s nothing to configure in Azure Portal, only in Azure DevOps, which is already done, and I expected to see again the Disconnect button after the next deployment — didn’t happen.

I’m trying to understand what exactly did I do (this is a dev/test environment, by the way). I would also prefer the "Disconnect" button back, at least it indicates that a connection exists.

Edit:
@wadezhou-MSFT this is the deployment task:

- task: Docker@2
  displayName: login to ACR
  inputs:
     command: login
     repository: $(acrImageName)
     containerRegistry: "$(dockerRegistryServiceConnectionDev)"
- script: |
     docker pull $(dev_docker_registry_name)/$(acrImageName):$(tag)
     docker tag $(dev_docker_registry_name)/$(acrImageName):$(tag) $(dev_docker_registry_name)/$(acrImageName):latest
     docker push $(dev_docker_registry_name)/$(acrImageName):latest
  displayName: Build and push dev image

The app-service is deployed using bicep with Azure CLI (used to be a AzureResourceManagerTemplateDeployment@3 task before):

resource appService 'Microsoft.Web/sites@2023-01-01' = {
  name: appServiceName
  location: location
  identity: {
    type: 'SystemAssigned'
  }
  properties: {
    serverFarmId: appPlan.id
    httpsOnly: true
    clientAffinityEnabled: false
    siteConfig: {
      ftpsState: 'Disabled'
      minTlsVersion: '1.2'
      scmType: 'VSTSRM'
      linuxFxVersion: linuxFxVersion
      appCommandLine: dockerRegistryStartupCommand
      appSettings: [
        {
           name: 'WEBSITE_RUN_FROM_PACKAGE'
           value: '1'
        }
        {
           name: 'WEBSITE_ENABLE_SYNC_UPDATE_SITE'
           value: 'true'
        }
        ...
      ]
      ...
    }
  }
}