SF Symbols beta should work on Catalina 10.15.3 and above (I'm on Catalina 10.15.5 and it works fine).

I'm not sure about the font mismatch, but you might need to uninstall SF Symbols 1, or check your Font Book and see if there's any warnings that you can fix.

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Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store