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I discovered a bug with portal. I placed two portal at the same location then there is the bug: I do not stop teleporting. Here is a concrete example:
'Idk' by 'Skillman'
The two portal is at the beginning.
And if I click restart button:
I wouldn't call it a bug, but more like the Portals doing what they were programmed to do. If you put one on top of the other, different devices will probably make the calculations differently on which Portal to listen to. Also it could be that, as you mention, you get stuck in a permanent loop between them.
I would recommend just not placing them like that
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