AFAICS this is not related to Silk icon theme references. The issue is more or less the other way around: xwiki trees somehow rely on FontAwesome and displays empty boxes instead of icons when using the Silk icon theme.
Adding the `icon` label to this ticket, and unlinking it from XWIKI-10755 as this is not an issue that would prevent us from deprecating Silk. The only link between those two is that they have the same label
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