Extras are not showing when using the kint Twig function

Problem/Motivation

I have Kint working as normal and I have added in the Devel Kint Extras module but I am not seeing those 'extras' that I once knew and loved!.

My Kint out out still looks like this...

Steps to reproduce

To clarify, I am attempting to Kint a simple Node in a pre-process function using this code...

if (\Drupal::moduleHandler()->moduleExists('devel')) {
    dpm($variables);
  }

And I have set up Devel to use Kint.

I cannot seem to use the kint() functions directly because I get a "Headers already sent" error when I do.

If anyone can help that would be great.

Thanks