'resourceTypedParamsAndOutputs' | The template resource requires an API version

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I am deploying an app service alongside two function apps. In order for the app service to work, it requires the url of the function apps. I am passing this along in the appSettings of the siteConfig.

In order to do this, I am using the experimental feature 'resourceTypedParamsAndOutputs'. I output the function app like so:

output nervexisAppServicePlan resource = nervexisAppServicePlan
resource nervexisAppServicePlan 'Microsoft.Web/serverfarms@2024-04-01' = {
  ...
}

output nervexisRdwMock resource = nervexisRdwMock
resource nervexisRdwMock 'Microsoft.Web/sites@2024-04-01' = {
  ...
}

output nervexisTecAllianceMock resource = nervexisTecAllianceMock
resource nervexisTecAllianceMock 'Microsoft.Web/sites@2024-04-01' = {
  ...
}

Then, in my main.bicep file I pass it along to the appService.bicep file:

module nervexisAppService './appService.bicep' = {
  name: 'deployAppServices'
  params: {
    projectName: projectName
    environmentAbbreviation: environmentAbbreviation
    nervexisRdwMock: functionApps.outputs.nervexisRdwMock
    nervexisTecAllianceMock: functionApps.outputs.nervexisRdwMock
    nervexisAppServicePlan: nervexisAppServicePlan.outputs.nervexisAppServicePlan
  }
}

And finally, I use it as shown below:

param nervexisRdwMock resource 'Microsoft.Web/sites@2024-04-01'
param nervexisTecAllianceMock resource 'Microsoft.Web/sites@2024-04-01'
param nervexisAppServicePlan resource 'Microsoft.Web/serverfarms@2024-04-01'


resource nervexisAppService 'Microsoft.Web/sites@2024-04-01' = {
  name: '${webAppServicePrefix}-${projectName}-nervexis-${environmentAbbreviation}'
  location: resourceGroup().location
  kind: 'app'
  properties: {
    serverFarmId: nervexisAppServicePlan.id
    siteConfig: { 
      appSettings: [
        {
          name: 'Caching:CacheType'
          value: 'Memory'
        }
        {
          name: 'Caching:DistributedCache:InstanceName'
          value: 'Nervexis-Gunnewiek-'
        }
        {
          name: 'Rdw:BaseUrl'
          value: 'https://${nervexisRdwMock.properties.defaultHostName}'
        }
        {
          name: 'TecAlliance:BaseUrl'
          value: 'https://${nervexisTecAllianceMock.properties.defaultHostName}'
        }
      ]
    }
  }
  tags: {
    project: projectName
    environment: environmentAbbreviation
  }
}

The nervexisAppServicePlan.id works fine, but when I try to reference the properties and retrieve the defaultHostName I get the following error:

{"status":"Failed","error":{"code":"DeploymentFailed","target":"/subscriptions/35ec59ef-30ea-4dd5-a315-636e0893bbbc/resourceGroups/gunnewiekbicep/providers/Microsoft.Resources/deployments/main","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"InvalidTemplate","message":"Deployment template validation failed: 'The template resource 'Microsoft.Web/sites/wapp-gnnwk-nervexis-test' reference to 'Microsoft.Web/sites/fa-gnnwk-rdw-mock' requires an API version. Please see https://aka.ms/arm-syntax for usage details.'.","additionalInfo":[{"type":"TemplateViolation","info":{"lineNumber":0,"linePosition":0,"path":""}}]}]}}

As far as I'm aware, the API version is specified in the resource parameter. I am new to bicep, so I could be mistaken but after reading the part 2 proposal of this feature I still could not find how I am meant to use this feature.