Steps to reproduce:
1. Open the attached “IN-76745_TimelineBug.zip” project
2. Stay in the “Untitled” Scene
3. Drag the docked Game View Window to the docked Scene View Window
4. Observe the results

Expected result: Game View Window is docked next to Scene View
Actual result: Game View, Scene View and Console Windows are closed and a “MissingReferenceException" error is thrown.

Reproducible in: 2022.3.59f1, 6000.0.40f1, 6000.1.0b8, 6000.2.0a5

Reproducible on: Windows 10, Windows 11
Not reproducible on: No other environment tested

Notes:

• Not reproducible on an empty project
• Only reproducible the first time the project is opened