Windows - Group resource member parameter outputs an array of SID's instead of Names

Puppet Version: 5.5.8 (PE 2018.1.5)
Puppet Server Version: 5.3.6
OS Name/Version: Windows 2019

This ticket has arisen from a support case where the customer had noticed that a custom fact of theirs that used the group resource parameter member no longer worked after upgrading from PE 2018.1.3 to 2018.1.5.

After a quick repro and speaking with some of the devs, this looks like a regression issue. In 2018.1.3, member outputs names and in 2018.1.5 SID's were outputted:

2018.1.3 (Puppet 5.5.3) Group resource:

group { 'Users':

  ensure  => 'present',

  gid     => 'S-1-5-32-545',

  members => ['NT AUTHORITY\INTERACTIVE', 'NT AUTHORITY\Authenticated Users', 'PL2U24SBREN5JPS\sshd', 'PL2U24SBREN5JPS\cyg_server'],

2018.1.5 (Puppet 5.5.8) Group resource:

group { 'Users':

  ensure  => 'present',

  gid     => 'S-1-5-32-545',

  members => ['S-1-5-4', 'S-1-5-11', 'S-1-5-21-1925060020-2411252292-4197056437-1000', 'S-1-5-21-1925060020-2411252292-4197056437-1001'],

Desired Behavior: Output of the Group Member parameter should be an array of Names and not SIDs.

Actual Behavior: Currently an array of SID's is outputted