After restarting Unreal 4.26 nothing in my project is visible in the perspective or camera viewport

Development Cinematics & Media
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1

After restarting Unreal nothing in my project is visible in the perspective or camera viewport What can cause this issue?

Here is a screen capture: Desktop 2021.01.20 - 01.38.42.03.mp4 - Google Drive

2

Is this thing only happening to me?