Edge of sunken platform reapppers

Yeah and it causes z layer fighting or as some might describe it, terrible visual flickering. Obviously it can't be seen from the picture but when moving the game camera about, those edges will basically flicker like strobo lights. Unfortunately I'm not sure when this started happening, perhaps within a year or so?

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I tested and found the same thing.  But it seems tied to the camera angle.  It flickers in and out as you rotate the camera around the sunken platform.  So, from some angles, you can't see it and other angles, you can.  Lots of flickering when you move from angle to angle.

Hope this helps.

well, yes and no. Depending on the camera angle, either the platform edge or the floor texture is rendered on top on a specific point (on the floor) from a specific point of view. When you move the camera, the platform edge and flooring sort of "fight" each other, switching constantly what is shown (rendered) on top, causing the flicker we see.

You can "see it" from every angle, it just varies how, err.. disturbing the end result of this "fight" is.

Encountered the same issue just now, found this thread while looking for a solution! The platforms in this room are fine, it's just the sunken area. 

Tried covering it up with a fence, that didn't help. 

It doesn't clip outside, but it does inside.