Unity bug? Missing prefabs and empty gameobjects on project opening, very frustrating.

Unity Engine
1

1920×1037 140 KB

Before closing Unity I saved scene and project manually from File → etc.
What is happening and why? RIP my work, not much, but it occured second time…

I’m using Unity 5.5.0f2

2

Have you checked the console? (Window → Console)
Looking at the bottom of the screenshot, it seems there are some errors there.

3

I remind that everything before saving and closing Unity worked perfectly fine without errors.