The key words might be "hinder" or "confuse". A runner in the way or a batter backing out is not as confusing as an non-participating offense player in the infield.
Going back to an early response, if I judged the uninvited player in the infield was the reason the catcher or other fielder failed to throw, I would call interference.
Of course, I would be watching, not napping.
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Officiating takes more than OJT.
It's not our jobs to invent rulings to fit our personal idea of what should and should not be.
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