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I was also surprised to find that after updating to the latest Catalina developer release 10.15.1 Beta 1 most of my 3rd party applications and all of my macOS System & Utilities applications reverted to their original icons. There was also nothing I could do to change them.How odd that an admin user isn't allowed to customize his own operating system by adding his own preferred icons, a perfectly harmless modification! Is this a bug or some new restriction in macOS Catalina that we won't be able to circumvent? I've gone back to the official 10.15 release from a Time Machine backup until either this issue has been confirmed as a bug, a workaround has been found or we're told there is no solution, in which case I'm going back to Mojave!Cheers