RSS Feed/News Dropdown BB code button will not render some FA icons in editor.

[ENXF NET]

I am trying to add a drop down BB code button to the rich text editor with a fa icon. It will render the icon in the editor when it is a short name such as fa-briefcase but not a long named icon such as fab fa-wikipedia-w. The icon does show in the admin panel though and works for individual buttons.
Not sure if this is a bug. XF 2.2.16 pl2
Thoughts?

Short name showing (fa-briefcase):






Long name showing (fab fa-wikipedia-w)...

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