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So I was standing right at the edge of a portal line when testing Arookas' wad out and I noticed when I changed my resolution, the portals stopped rendering.
Spoiler: Pic
And then I discovered the player can still be rendered a little bit:
Spoiler:
But when standing back far enough, it's black.
Spoiler:
On rare occasions there's the flicker of something happening in front of the screen.