Ocean floor is a flat plane

Having this weird issue where the ocean floor is a perfectly smooth flat plane. As I'm on a world gen mod, the actual ocean height is lower than where this is set, and I couldn't find an option to change this if one exists. Also, this visual even occurs on Extreme settings, which isn't ideal. Is there any way to fix this or at least move the plane down to a settable position?

Solution:

just looks like a cave culling issue to me. the ocean floor is probably lower than Y 40

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