My take on the impossible cube...no viewports and render targets used!
My solution is shader based. The object inside the cube is visible when viewed trough a "portal".
You may find this example scene and the code here: https://github.com/ArmainAP/Godot-Occlusion-Portals
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Did you forget to push it? I'm only seeing a gnu license file and that's that
It's on master. Which is a bit confusing because OP also has a main.
Not anymore! Merged it to main.
I haven't noticed that I was working on master instead of main. Merged it to main now