Do you use Strip/Freeside extended? Those are technically brand new maps, so you may be, for whatever reason, taken to the "Old" Strip, which is now an empty desert. Lucky 38, for example, is also just a barren desert world, it's just that you are always inside the lucky 38 while you're there, then you go back to the "Strip World" when you exit the lucky 38. Open Strip would be an entirely new world altogether, but since you said you merged some mods, maybe the door pointers still send you to the old strip world, for some reason
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