I’m stuck with a troubling issue. Parts, if not the entirety, of the external world disappear during navigation in the MLO even after removing the occlusion boxes. I’ve already checked the portals and found nothing wrong (though I can look again without issue), as well as recreated them from scratch and even made transition portals (not sure if I did it right) between the larger interior rooms (since they’re different “rooms” in the ytyp). What else could be causing this? Is there more occlusion stuff that might be invisible in Codewalker that I haven’t removed? Is there any flag configuration for the portals (besides the ones described here PORTALS) Or could the issue be something else?
Video: https://youtu.be/Jdy1W8Sf7z4
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portal direction, the blue arrow should point out ie from room to limbo
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Yes, it is. The portals in the windows and doors point to limbo, the internal portals point to the larger rooms that have portals that point to the exit. They are all correctly pointed to the outside of the mlo. 
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check
floor ID and room ID match.
shell is actually applied to limbo
If you cant troubleshoot it after that, redo your ytyp with only one room and see if that fixes it
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Nothing, neither matching the floor ID with the room ID nor recreating the ytyp with just one room, solved the problem. The outside world keeps flickering. I’m completely perplexed and lost.
I can have a look at it for you if you want to send me the project folder privately
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Sure, no problem. How can I send it to you?
either throu dm or upload to a file site and send me the link
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You can also upload to this site assuming the filesize isnt too large.
I recommened that why in case he wanted to keep it private :), I did forget about that thou, thanks for the reminder 
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