azurerm_network_watcher_flow_log tags aren't updated

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Terraform Version

1.9.0

AzureRM Provider Version

4.0.1

Affected Resource(s)/Data Source(s)

azurerm_network_watcher_flow_log

Terraform Configuration Files

resource "azurerm_network_watcher_flow_log" "this" {
  ...
  tags = {
    "cdt-service-level-class" = "missing"
  }
}

Debug Output/Panic Output

# module.resource_group.module.network_spoke[0].azurerm_network_watcher_flow_log.this will be updated in-place
  ~ resource "azurerm_network_watcher_flow_log" "this" {
        id                        = "/subscriptions/f0...-...-...-...-.../resourceGroups/NetworkWatcherRG/providers/Microsoft.Network/networkWatchers/NetworkWatcher_westeurope/flowLogs/nsg-prod"
        name                      = "nsg-prod"
      ~ tags                      = {
          ...
          ~ "cdt-service-level-class" = "undef" -> "missing"
        }
        # (7 unchanged attributes hidden)

        # (2 unchanged blocks hidden)
    }

Expected Behaviour

When applying a Terraform plan to update the azurerm_network_watcher_flow_log resource, any changes to the tags block (such as modifying the value of an existing tag) should be applied in-place.

Actual Behaviour

The current behavior is that tag updates are not being applied during in-place updates, even though Terraform detects the changes and lists them in the plan.

Steps to Reproduce

create a configuration based on this example
add tags to the just created resource
terraform apply
change tag value
terraform apply
terraform plan again to see that this change is planned again

Important Factoids

No response

References