Steps to reproduce:
1. Open attached project and go to the scene named "DemoScene"
2. See "logo" sprite in the assets folder and place it on the scene so it would be visible through the Main Camera
3. Press play
4. Notice that sprite's material turns to pink color (see images attached)
5. Exit the play mode
6. Notice that the sprite is no longer visible on the scene, although it is visible through the camera (still with pink color)

Expected behavior: The sprite should always keep it's default material and stay in the scene after playmode exited
Actual behavior: Sprite's material turns to pink color after playmode entered

Reproduced on:
5.4.0b14, 5.4.0b18

Did not reproduce on:
5.4.0b1, 5.3.5p1, 5.3.4f1