This is caused by a buggy script, see xdg-icon-resource: unbreak syntax by removing stray grave accent for the upstream fix. If you don’t want to wait for RH to ship this, you can simply apply the fix yourself. Open /usr/bin/xdg-icon-resource with an editor, go to line 981 and remove the stray grave accent from there. Reinstalling Chrome/Brave/… will then succeed in setting an icon.
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