https://github.com/Wilyicaro/Legacy-Minecraft/blob/1.20.4/common/src/main/java/wily/legacy/mixin/CreateWorldScreenMixin.java#L99

Here you are overriding init completely, which makes any mods that inject here fail hard. An easy solution is to just inject at HEAD and always cancel.

Related issue isXander/Controlify#310

Why would you want controlify tho?

Why would you want controlify tho?

I bet this isn't exclusive to Controlify, and to answer your question: Controlify is a significantly more powerful controller mod than what is included in this mod, such as vibration.

Fixed in version 1.6.3, thanks for reporting!