It's not a "bug" of this font. PUA can be used in any way by any fonts.
This problem is because Un-fonts precedes Font Awesome in your
fontconfig configs.
** Changed in: fonts-unfonts-core (Ubuntu)
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1531126
Title:
Usage of Private Use zone(0xE000 - 0xF8FF) in "UnDotum" font causes
Font Awesome icons rendered wrongly in Mozilla Firefox
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