XenForo FA icons on notices

[Old Nick]

FA icon syntax and "pre-load" FA icons seems to not working on notices.
This is the code i used in a notice and in a HTML widget
HTML:

<xf:button class="button" icon="save">test</xf:button>
<br>
<xf:fa icon="fas fa-comments" /> Hello

And this is the results for the widget:



And for the notice



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