Dice getting stuck on invisble wall

I am completely new to unity, so I am sorry if there is an obvious and easy fix for this problem.
I have created a dice app using this tutorial Breakfast With Unity: 3D Dice Roller Part 2 - YouTube
But I have a few issues with it. The more important one is, that my dices sometimes get stuck between an invisible wall and another dice like in the picture:

How can I overcome this obstacle? Is there a way to make the walls “bouncy” or something?


Add a Physic material on the colliders.

There is a Bouncy preset, but you can configure your own.

Source: Unity - Manual: Physic Material component reference