The plane changes its color after Launching LAN Host

1. What happened

2. How we can reproduce it using the example you attached
1 Create new project
2 Create plane and save the scene
3 Create Empty Object and add Network Manager and Network Manager HUD
4 In Network Manager for Online and Offline scenes set created early scene
5 Press Play and launch LAN Host
6 Press Stop(X)-button in game view (to stop the Host)

OR just open attached project and "Press Play and launch LAN Host"

Actual result: The plane changes its color
please see attached video