Not sure if I would like to be a BLU guy because those lights would give me a headache

How do I open this map?

You're supposed to use the light entity in conjunction with the light_spot.

I would recommend the use of the light entity more then just light_spot, as the ceiling is completely dark with nothing lighting up, which makes no since as the brightly colored walls and floors would suggest other wise.

Brilliant!

@=[P.F.F]= PrivateerMan I unfortunately haven't heard back from the others I've asked to test it out, so I can't give a definite answer to where the problem may be. The only solution I have is a band-aid one for now, and that's to replace the offending models and save it as a new session. I don't feel extremely helpful in suggesting that, but it's all I have at the moment.

I do, but I keep it in its own folder (which I labeled "sfm_beta") and for some reason, the session replaced a number of props with other, almost unrelated models.
For instance, the floating coffee mug above the fridge replaced the Alarm-O-Tron bell, the calendar in the ground replaced the scaled cigarette machine, and those two big ERRORs were copies of the Agent Gunn coffee machine, instead of the dynamic coffee pots they were supposed to be. Same goes for the pile of paper cups, which was for some reason replaced by the floating water cooler.
After manually removing all the offending overwriting models and subsequently ignored the "update" to this submission, most of the items were in their proper places.

@=[P.F.F]= PrivateerMan Do you have the SFM beta content installed? And if so, what's the directory you have for it? Because it appears that the coffee pots and cigarette machine are what's missing, and I created a separate game folder for those props and I'm not sure if it'd make a difference if you've put them in your usermod. I don't know about the other props, as that floating coffee mug above the fridge is odd.

I've had a friend test it and it worked fine for them. I'll ask a couple of other people to test it out before I can figure out if it's the session or something on your end.

BLU > all > RED

I don't know if it's just me or if your session is glitched, but it actually messes up a lot of my props, and gives me a whole mess to deal with when it comes to the props, as seen in these screenshots:
https://imgur.com/a/mAVOzpL
When I find and remove these offending props from my files and restart SFM, it offers to "update" this submission.