Created Unassigned: RenderGdiPlus or Render for Winforms Y-limit? [9100]

This code fails to draw the string:

private void HTMLTest_Paint(object sender, PaintEventArgs e)
{
TheArtOfDev.HtmlRenderer.WinForms.HtmlRender.RenderGdiPlus(e.Graphics, "test <b>bold</b>", new PointF(100,21), new SizeF(500,500));
}

However, changing the Y location to 20 or below works. Is it a limit in the canvas or a bug?