When Dr. Smith finally asks for too much from the wishing machine, all the items wished for at the Jupiter 2 become defective but not the items at Smith's campsite in the derelict alien ship (nor the eaten food in anyone's stomach). Later, all items at Smith's campsite disappear along with the alien. (We never hear if the same happened to items at the Jupiter 2, which would have left Judy suddenly naked if, for some reason, she hadn't yet changed out of her ragged dress).
Maureen turns the force field on before the men clear the area, yet they don't get jolted.