If the original game class - for example MissionGameplay - defines a function

void OnUpdate(float timeslice)

a modded class MUST also name the parameter "timeslice" or else it won't compile - saying that he can not find the new name as a variable. So

override void OnUpdate(float otherVariableName)
{
    super.OnUpdate(otherVariableName);
    ...
}

is currently invalid.

The function signature should not care about the name of a parameter and only about types and order.

This bug has rather large implications when one of the game functions changes it's parameter names. All mods that override that function break in that case.