[AVM Module Issue]: avm/res/web/site with slots returns invalid output

[Hoaas]

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Issue Type?

I'm not sure

Module Name

avm/res/web/site

(Optional) Module Version

0.13.1

Description

Using the slots parameter leads to error in the deploy, yet the resources are created as they should.

Template works fine without slots, or if slots is []. When any slots are given the error in the Azure Portal reads this:

  "details": [
    {
      "code": "DeploymentOutputEvaluationFailed",
      "target": "slotSystemAssignedMIPrincipalIds",
      "message": "The template output 'slotSystemAssignedMIPrincipalIds' is not valid: The language expression property 'value' doesn't exist, available properties are 'type'.."
    }
  ]

Below is part of the parameters I've used. ipSecurityRestrictions, basicPublishingCredentialsPolicies and appSettingsKeyValuePairs is removed.

module webApp 'br/public:avm/res/web/site:0.13.1' = {
  name: 'siteDeployment'
  params:{
    // Required parameters
    name: appName
    kind: 'app,linux'
    serverFarmResourceId: appServicePlan.id

    // Optional parameters
    location: resourceGroup().location
    tags: tags
    managedIdentities: {
      userAssignedResourceIds: [
        userAssignedIdentity.id
      ]
    }
    siteConfig: {
      alwaysOn: true
      http20Enabled: true
      use32BitWorkerProcess: false
      linuxFxVersion: 'DOTNETCORE|8.0'
      ftpsState: 'Disabled'
    }
    slots: [
      {
        kind: 'app,linux'
        name: 'staging'
      }
    ]
  }
}

(Optional) Correlation Id

No response

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[avm-team-linter]

@Hoaas, thanks for submitting this issue for the avm/res/web/site module!

Important

A member of the @Azure/avm-res-web-site-module-owners-bicep or @Azure/avm-res-web-site-module-contributors-bicep team will review it soon!