Some shapes don't draw some of the time in the Editor

I've got some immediate mode code that is roughly:

using (Draw.Command(cam))
{

  Draw.Disc(...);

  Draw.Text(...);

using(var path = new PolylinePath())
  {

  ...

  Draw.Polyline(path);
  }

}

Sometimes the Text and polyline don't render, just leaving me with the discs. The problem occurs when I switch between the Scene view and Game view (while the application is not playing). They only render on the one I had visible during the last domain reload. If I have both tables visible then it flickers between the two depending on where mouse focus is.

It's not 100% reproducible, but seems to happen nearly all the time. I experienced this with a fresh project, with just script in it.