Invincible glitch I found on tag der toten

I found a glitch on tag der toten that I don't think has been discovered before because I can't find anything about it anywhere online, and this glitch makes you invincible from the zombies the whole game so you can easily go to a high round, and to get this glitch to happen you have to use the "anywhere but here" elixir at the secret mars spot (so don't use the boat to get back) and you'll be teleported back to the map but zombies will no longer spawn, and I found this first glitch like a month before discovering the invincible glitch where the zombies will literally never respawn again even after the round changes or if you do the lockdown for the samantha box equipment which would normally spawn in extra zombies but it doesn't with this glitch, so after you do that first glitch you want to make sure you have the easter egg step where you throw the samantha box at the campfire ready which will spawn the zombies back in after the dialogue is finish, then the zombies will all be confused and won't attack you the whole game, making you invincible, so if anyone ever wants to get to a really high round especially on realistic difficulty, I recommend doing this glitch because it's insanely broken and very easy to do, and it's on tag der toten which has a very fast high round strategy that I'm sure most of you already know where you just camp in the power switch room that has the one window that all the zombies spawn from at the top of the boat.