Oh come on! Are we distinguishing between different gunpla production runs of the same model now?
Left (2nd panel) is the intended Zeta Plus model. Right is the initial production run with two 'mismolded' parts: a deformed vulcan mount on the head and a 'crotch plate' with missing details.
Gotta thank the twitter comments for pointing these out. They even provided pictures of the parts in question.
Updated
Going back to the basics with what you dropped, are we?