With chaos, I wouldn’t even attempt it.
With physX the solution is to change the rate at which physics are calculated.
Your problem is that the coin is small. The floor is obviously too small.
The speed at which the coin is moving is causing the collision calculation to fail.
Having more calculations happen is normally an ok sulution for it.
Still, a thicker floor will do the trick almost as well.
Take the smallest side, multiply it by the speed at which its falling.
Each frame, the floor has to be thick enough to cover that value for a response to be able to occur…