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I think you have to call KeyBinding.resetKeyBindingArrayAndHash after you've changed your key code in your keybinding to recalculate the cached keyCode <-> keybinding map.

You might be calling the second method on the server and so nothing happens. The first implementation ensures that the particles are spawned on the client. However it is also the case that you might be reaching across logical sides there. Basically I think that whenever you are calling these methods the actions actually happen on a server, not on the client. However because you are running the physical client and not the server the proxy being injected is the client proxy. And in that proxy you are explicitly using the client world for spawning your particles. This way the particles work since you are spawning them through a client world and you see them because it is the physical client but what is actually happening is you are reaching for the client from a server thread - and that is called reaching across logical sides and must never be done. And the reason the second method isn't called on the client is likely because some kind of condition isn't satisfied on the client but is satisfied on the server. For example vanilla uses data parameters to sync the fuse timer of the TNT to the client so it is always aware of the fuse and is able to do client-related stuff according to it, like the flashing animation. You need to satisfy that condition on the client by using a DataParameter or packets, as I've told you twice already.