Spot lights' gizmo is incorrectly rotated in the X axis

[zomboh]

Given a very simple scene:

    <a-box color="red"></a-box>
    <a-entity
      light="type: spot; angle: 30"
      position="0 2 0"
      rotation="-90 0 0"
    ></a-entity>

The inspector shows this:

The gizmo should be facing -Y, as the lit box's face shows, but instead it's looking at +Z.