IIS : Setting Application pool .NET CLR Version to No Managed Code in 2008 R2 does not work

Basic Info
Module Version: 4.5.1
Puppet Version: 6.4.0
OS Name/Version: Windows 2008 R2, Windows 2016**

When setting the application pool .NET Framework Version to No Managed Code (using "" as per the documentation) it sets it to "" and breaks the application pool

Example code:

iis_application_pool { 'test': 

ensure => 'present', 

managed_pipeline_mode => 'Integrated', 

managed_runtime_version => '""', 

state => 'Started', 

auto_start => true, }

Desired Behaviour:

Application pool .NET Framework Version is set to No Managed Code

Actual Behaviour:

Application pool .NET Framework Version is set to "" 

The application pool stops when a page is requested.

This also happens if the application pool .NET Framework Version is already set to No Managed Code