Upgrade to FontAwesome Pro in ASP.NET Zero (Angular) / fas far icons displaying as squares

I was asked to upgrade an ASP.NET Zero project with the Font Awesome Pro icons.

I followed the steps here Installing the Pro version of Font Awesome

After adding the below in the angular.json

"node_modules/@fortawesome/fontawesome-pro/css/all.min.css"

I found that some of the pro fonts did not want to display specifically some of the solid(fas) and regular (far) fonts.

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