A concept of a common proxy makes no sense. Proxies exist to separate sided only code. If your code is "common" then it goes into your mod class, not into your proxy.   serverSide = Reference.COMMON_PROXY_CLASS This makes even less sense. Server proxy either hosts noop methods that are only applicable for the client or server-side only methods. Your common proxy can't be your server proxy.   ItemBase is an antipattern. You do not need it.   public static final Item
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