When the projection of Scene camera is changed via 'SceneView.lastActiveSceneView.orthographic', the Scene Gizmo label, indicating the projection of Scene camera, is not updated to match the actual value of 'SceneView.lastActiveSceneView.orthographic'.

Steps to reproduce:
1) Open the latest attached project.
2) In the Menu, go to Camera Menu > Switch Camera Type.

The projection of the Scene camera switches between orthographic/perspective, however, the Scene Gizmo shows the last setting that was set manually (by clicking on the Gizmo itself). Only the text is not updated - the three lines (parallel when orthographic, connected at one end when perspective) are updated properly.
Code used in the Editor script: SceneView.lastActiveSceneView.orthographic = !SceneView.lastActiveSceneView.orthographic;

Reproduced on:
5.6.0b7, 5.4.4p2, 5.2.4f1