Several Draw.Line not working in ImmediateModeShapeDrawer (starting with the sample)

Hi,

First of all, great job job with this asset!
I've looked around to see if this had been asked before, but I didn't find anything, so I wonder if this is something related to my Unity version/setup or if it is a recent issue.

I started by playing around with the default shape components, and everything was going well and being nicely rendered.
Then I moved on to trying to create shapes procedurally using the ImmediateModeShapeDrawer, so I started with your doc sample:

[ExecuteAlways] public class MyScript : ImmediateModeShapeDrawer {

	public override void DrawShapes( Camera cam ){

		using( Draw.Command( cam ) ){

			// set up static parameters. these are used for all following Draw.Line calls
			Draw.LineGeometry = LineGeometry.Volumetric3D;
			Draw.ThicknessSpace = ThicknessSpace.Pixels;
			Draw.Thickness = 4; // 4px wide

			// set static parameter to draw in the local space of this object
			Draw.Matrix = transform.localToWorldMatrix;

			// draw lines
			Draw.Line( Vector3.zero, Vector3.right,   Color.red   );
			Draw.Line( Vector3.zero, Vector3.up,      Color.green );
			Draw.Line( Vector3.zero, Vector3.forward, Color.blue  );
		}

	}
}

But nothing would appear on the screen. After trying some of your other sample scripts, I saw that ImmediateMode was working, so I started from there. That's when I realized that the problem lied in trying to render more than one line. So, for the above example, if I comment the last two Draw Lines:

			// draw lines
			Draw.Line( Vector3.zero, Vector3.right,   Color.red   );
			//Draw.Line( Vector3.zero, Vector3.up,      Color.green );
			//Draw.Line( Vector3.zero, Vector3.forward, Color.blue  );

It does render the red line. But once I uncomment one of the other Draw.Line calls, none of them is rendered.

Also, I'm not sure if this is related, but nothing appears on the Procedural Tree sample scene (just a complete black canvas and a grey, empty scene in the editor - the objects are there but no shapes are drawn).

Not sure if relevant, but I'm targeting Windows. But the issue occurs both on the editor, play mode and builds.

Thanks in advance,

Pedro