Is there a way to prevent the 'automatic cube catching' while you are in the air?

When I try to let the cube fall down, while Iam flying in the air, the game would catch
it automatically and put it back into my hands... can I prevent this anyway?

h3X wrote:
Maybe you can cover it in clip brushes until it lands?

This would not work at this point, because the player already has the cube.

I want the player to let it fall down sometimes, but this does not work,
because the game catches the cube directly after droping it from hand...

Instead of use a cube entity use a prop_physics_paintable, use the cube model and then in the flags disable player pickup. Make it so that the cube dissapears from the players view, just for a split second, and change it with a cube entity.