As of 12/8/2021, a patch was made for Doublefrost to prevent Teleporters from being placed on top of spawn doors, but the lower door still has a small area where you can build and still be in the door. Whether you can or can't do still do the exploit, don't know currently. What I do know is it's still unpatched on Doublecross.

I've known this exploit since December 2017
It never got patched, so dropping this to the public with a new variant of this map officially out.
Build a teleporter at the lower door, get a Spy to accept your partner taunt, and now they enter your spawn.
Resupply cannot be interacted with, and the Spy can only leave via dying or another teleporter.

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