The Arab peoples predominantly living in those areas of sovereign Israeli territory wish to secede and form their own State (or at least that's what the West tells them they want to do). This can only be done through a treaty agreement with Israel which establishes where one State ends and the other begins.
Should you wish to argue that Israel occupies another State, you are going to have to show me the existing treaty which delineates the territorial integrity of the nascent State of Palestine. And herein lies the problem. There isn't one.
There was a war of aggression committed by two belligerent States who have no legal claim to that territory and yet acquired territory outside their boundaries by force (Jordan and Egypt). Since we agree, and 242 confirms, the "inadmissibility of acquisition of territory by force", you must concede that the territories of Gaza, the West Bank, and parts of Jerusalem do not, can not, and have never been the sovereign territory of Jordan or Egypt.
Which means, there is no State for Israel to occupy. As I said before, all of the Mandate of Palestine territory remains one territorial unit - Israel.