webgl bug or restriction

Hi, I have a very simple scene - an array of points that are rendered as a line stripe.

Beginning with the iteration 6 only a part of a whole cube is rendered which I believe is not a bug on my side. With each iteration number of points increases 8 times but coordinates are normalized to be inside of a unity cube (0,0,0 - 1,1,1). So it cannot be that points are off a clipping region.

Could anyone shed some light on the subject?

only a part of the cube is rendered