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I have looked into the function and there is an additional " void * " parameter in the dissector_t function.

Yes, there is. A dissector is handed, as its last argument, a void *, which is a pointer to private data being passed to the dissector. Most dissectors are just passed a null pointer; what it gets passed depends on what's calling it.

Should that parameter be retained

Yes. It has to be there, even if the dissector ignores it.