Azure MySQL Flexible Server source_server_id imported incorrectly for replica server, forces recreation

[kamilzzz]

Is there an existing issue for this?

• I have searched the existing issues

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Terraform Version

1.9.5

AzureRM Provider Version

4.2.0

Affected Resource(s)/Data Source(s)

azurerm_mysql_flexible_server

Terraform Configuration Files

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "4.3.0"
    }
    random = {
      source  = "hashicorp/random"
      version = "=3.6.2"
    }
    azapi = {
      source  = "azure/azapi"
      version = "=1.15.0"
    }
  }
}

provider "azurerm" {
  features {}
}

resource "random_string" "suffix" {
  length  = 6
  upper   = false
  special = false
}

locals {
  location            = "germanywestcentral"
  resource_group_name = "mysql"
}

resource "azurerm_mysql_flexible_server" "primary" {
  name                = "mysql-primary-${random_string.suffix.result}"
  location            = local.location
  resource_group_name = local.resource_group_name

  administrator_login    = "abcadmin"
  administrator_password = "abcp@ss123"

  sku_name = "GP_Standard_D2ds_v4"

  lifecycle {
    ignore_changes = [zone]
  }
}

resource "azurerm_mysql_flexible_server" "replica" {
  name                = "mysql-replica-${random_string.suffix.result}"
  location            = local.location
  resource_group_name = local.resource_group_name

  create_mode      = "Replica"
  source_server_id = azurerm_mysql_flexible_server.primary.id

  lifecycle {
    ignore_changes = [zone, create_mode]
  }
}

Debug Output/Panic Output

# azurerm_mysql_flexible_server.replica must be replaced
-/+ resource "azurerm_mysql_flexible_server" "replica" {
[...]
      + source_server_id              = "/subscriptions/XXX/resourceGroups/YYY/providers/Microsoft.DBforMySQL/flexibleServers/mysql-primary-ZZZ" # forces replacement

Expected Behaviour

source_server_id property to be properly imported.

Actual Behaviour

source_server_id property is not imported properly. It always imports as an empty string.
Next plan/apply forces recreation which is not desired.

Steps to Reproduce

1. terraform apply configuration from above
2. terraform state rm 'azurerm_mysql_flexible_server.replica'
3. terraform import 'azurerm_mysql_flexible_server.replica' 'replica-resource-id'
4. Run terraform plan
5. Observe source_server_id proeprty was not imported (empty string in the state) and that plan tries to recreate replica

Important Factoids

No response

References

There was a previous issue regarding this topic created by me - #27272 with follow up PR which meant to fix it - #27295, but that PR was incorrect.

I created a new PR to fix this issue - #27442