DrawMeshInstancedAPI] Instanced objects blink when resizing Game view tab

Steps to repro:

1. Open Unity;
2. Open attached project and 'test' scene;
3. Run the scene;
4. Resize Editor's Game view.

Actual result:
Objects drawn by DrawMeshInstanced API blink (see attached gif video).

Expected result:
Objects should be rendered smoothly without blinking.

Notes:
- Reproduces in 5.5.0b3;
- Reproduces on both OSX 10.11.6 and Windows 10;
- Doesn't reproduce when spawning regular instanced gameobjects.