I’m seeing some icons missing, and showing instead the unicode for it. Not all icons, just a few. Specifically, Blog, Media, Comments. Instead of the icons, it shows unicode “f040”, “f03e”, “f086”, respectively. But I’m using this plugin on 4 sites and it’s only happening on two.
This plugin was previously using FontAwesome icons for some menu items, which can conflict with other plugins also loading the same library. I removed the FontAwesome icons from the plugin so it now uses default WordPress icons throughout.