I am getting tired of this, I am trying to make a secret passageway to a rocket launcher but UDB automatically fills a sector in the middle, removes the "Impassable" box and also removes the textures of the linedefs.
I am making a window with ammo behind it to give the player a military base feel, the lower texture of the back side does not have any textures, is it even necessary to add a texture? the player can not reach there.