Azure Logic App Action Functions

Terraform Providers Azure
1

I am facing an issue with Terraform 1.2.6 when trying to create an Azure logic app. I have it set up like this:

# Define the logic app

resource "azurerm_logic_app_workflow" "generic_app" {
  name                = "generic_app" 
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
  identity {
    type = "SystemAssigned"
  }
}

# Run the logic app every 5 minutes

resource "azurerm_logic_app_trigger_custom" "generic_app_trigger" {
  name         = "generic_app_name"
  logic_app_id = azurerm_logic_app_workflow.generic_app.id

  body = <<BODY
{
  "recurrence": {
    "frequency": "Minute",
    "interval": 5
  },
  "type": "Recurrence"
}
BODY

}

# Perform the first action

resource "azurerm_logic_app_action_http" "generic_app_action_1" {
  name         = "HTTP"
  logic_app_id = azurerm_logic_app_workflow.generic_app.id
  method       = "POST"
  uri          = "https://some-endpoint.com"
  headers = {
    "authorization" = data.azurerm_key_vault_secret.authtoken_secret.value
    "content-type"  = "application/x-www-form-urlencoded"
  }
}

# Perform the second action if the first action completed

resource "azurerm_logic_app_action_http" "generic_app_action_2" {
  name          = "HTTP_1"
  logic_app_id  = azurerm_logic_app_workflow.generic_app.id
  depends_on    = [azurerm_logic_app_action_http.generic_app_action_1]
  method        = "POST"
  uri           = "https://some-endpoint.com"
  body          = "@decodeBase64(triggerBody()?['ContentData'])"
 
  headers = {
    "api-key"                = data.azurerm_key_vault_secret.api_key_secret.value
    "Authorization"            = "Bearer @{body('HTTP').access_token}"
    "Accept"                   = "application/json"
    "Content-Type"             = "application/json"
  }
  run_after {
    action_name   = "HTTP"
    action_result = "Succeeded"
  }
}

The terraform apply is successful, but in the Logic App Designer the HTTP_1 action body (@decodeBase64(triggerBody()?['ContentData'])) does not appear correctly:

screenshot-1

Instead it should be using the decodeBase64 function and appear like this:

screenshot-2

screenshot-3

I have also tried using a azurerm_logic_app_action_custom resource block instead:

resource "azurerm_logic_app_action_custom" "generic_app_action_2" {
  name         = "HTTP_1"
  logic_app_id = azurerm_logic_app_workflow.generic_app.id
  depends_on   = [azurerm_logic_app_action_http.generic_app_action_1]

  body = <<BODY
{
  "type": "Http",
  "inputs": {
    "method": "POST",
    "uri": "https://some-endpoint.com",
    "body": {
      "ContentData": "@{decodeBase64(triggerBody()?['ContentData'])}"
    },
    "headers": {      
      "Authorization": "Bearer @{body('HTTP').access_token}",
      "Accept": "application/json",
      "Content-Type": "application/json"
    }
  },
  "runAfter": {
    "HTTP": ["Succeeded"]
  }
}
BODY
}

But this is also not working. Is there a way to define functions? Or is this a bug?