Rippled/bumpy spline landscape layer

Development World Creation
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1

When using splines to modify landscape the generated surface is rippled/bumpy.

I prepared few screenshots with light angle to exaggerate effect using shadow.
It is rather not big visual problem, but when landscape is a data source for my physical simulation, I can feel this bumps here and this is a real issue here.

It seems it is not directly connected how dense is landscape grid - in very dense grid it also happens and is even more visible. The bumps are obviously in generated geometry - it is clearly visible on last screenshot.

Looks like there is an intermediate mesh generated from spline, that is low resolution, and is a base of landscape grid modification.
Is this possible to make it more accurate, or any idea how to workaround this problem in other way?

Landscape Spline landscape-splines

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Just as I thought it looks like spline generate intermediate mesh with low density grid - on screenshot curved one is based on grid 11x4 vertices (barely visible - green grid on green color).

At the bottom (smaller one) is 21x4.

I don’t know why Engine choose different density for this two splines, and how could I control that.
That what I would is to create this plane with way denser grid.
Is this possible to configure that?

3

Last (but best) screenshot to show how it (don’t) works

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The goal is to increase that green mesh vertices density.