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The HOM in the sky appears to be vanilla Doom II's draw limitation. Not sure if it's based on distance only, but I suspect it depends on the amount of stuff that needs to be rendered as well.
It's a map for vanilla doom 2, it have new textures from plum's sky extravaganza, evilution and skulltag...
also there's a HOM in the sky in the starting outdoor for some obscure reasons, i tried in all the ways to fix that, but it only get worse T_T
hope you like it.