You're not helping yourself. Most likely deliberate.
You've been told how it works.
I'm not the one needs help here. That would be you, as clearly demonstrated by your complete inability to answer a very simple question.
Also demonstrated by your contradictory model where you need to provide numerous contradictory explanations to try and explain different things, and at times need to appeal to contradictions in the explanation for a single thing, such as rockets in a vacuum.
You are yet to tell me how it works because you repeatedly leave out a key part.
This key part results in one of 2 conclusions depending upon what route you take.
Either there is something for the gas to use as leverage, which means the rocket can use it as well (or the rocket is the leverage and thus the rocket uses the gas as leverage), and thus rockets do work in a vacuum,
or there is nothing for the gas to use as leverage and thus it cannot move and thus the gas remains trapped in a tube while exposed to a vacuum.
In order to tell me how it works you need to tell me what the gas is using as leverage/resistance/foundation/whatever BS you want to call it.
The simple one in real physics is what the gas is pushing against.
Until you tell me what the gas is using as leverage in a clear way, and clearly explain why the rocket can magically not use it (and why it isn't the rocket itself), then you have not explained anything.
So again, what is the gas using as leverage?
Only if it's contained at both ends.
Which again would mean bombs don't work.
Back in reality, the gas still exerts pressure in all directions, pushing anything it is up against outwards.
That means it will accelerate shrapnel in bombs and rockets.
Open one end and your legs straighten out without the need to push your head off the closed end.
But it still pushes away the other end.
That is the point, you don't need to push off the top to be able to push the bottom, your own mass will provide resistance to motion.
It would if the pressure was not dissipated.
So if the pressure is dissipated by the gas before it leaves the rocket, then it doesn't matter what it is pushing into, i.e. if it is pushing into air or a vacuum.
So yet again, rockets work in a vacuum