"NullReferenceException: Object reference not set to an instance of an object" errors become visible when "Maximize" window function is used in "Runner Game" tutorial section

How to reproduce:
1. Create a new project using the "Runner Game" template;
2. Go to "Tutorial" section;
3. Click on meatball menu and select "Maximize";
4. In new maximized view select the same menu and select the same "Maximize" function;
5. Observe "Console" window.

Expected results: Window should be returned to the initial view. No errors should be in console.
Actual results: Console displays errors.

Reproducible with: 2021.3.13f1
Could not test with: 2020.3.41f1, 2022.1.22f1, 2022.2.0b14, 2023.1.0a18 (Template is not available)