Disappering displacment in water in the 3d-skybox

Simulacron

L-3: Simulated Member
aa
Feb 17, 2016
313
326
I try to create an ocean by using the 3d-skybox, but when I load up the map parts of the displacment of the cliff and of the ground that is underwater that are in the 3d-skybox, aren't displayed if they are underwater. My map has no leaks and interlopers.net don't finds any othe problems beside the "can't load skybox file skybox/sky_coastal_01 to build the default cubemap!"-problem. My water is completly enclosed with skybox brushes in the 3d-skybox.
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