Click-problem with two cameras

The menu items should be displayed fixed. For technical and other reasons, I don’t want to use the GUI elements. I found an example that uses two cameras to solve this problem.

The menu item (symbolized by the cube) can be clicked, but the sphere (symbolizing the application) cannot!

What could be the reason?

https://www.babylonjs-playground.com/#TD72QV

Solution: https://www.babylonjs-playground.com/#ZZY18#3

Ticket closed.

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