Why am I falling through floor near linked_portal_doors? [closed]

Why am I falling through floor near linked_portal_doors? [closed] - Room Interior Illuminated by Sunlight Coming Through Window 

I am creating a map for Portal 2 in Hammer and I have a few linked_portal_doors. The floor near some of them makes you fall through. Can someone please tell me why and how to fix it?






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Why am I falling through floor near linked_portal_doors? [closed] - Railroad Tracks Running Through Autumn Birch Forest
Why am I falling through floor near linked_portal_doors? [closed] - Black Floor Tiles
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Images: Константин, Ludvig Hedenborg, Chris Gonzalez, Chris Gonzalez