How does the bounciness of a physics material work on a curved surface?

Currently, I'm trying to make a game with pinball like physics.
https://imgur.com/a/U1SiLZN



Here is the mesh collider we're using.

We attached a physics material with bounciness at 1, dynamic friction at 0, static friction at 0, friction combine at minimum, and bounce combine at maximum.

For straight walls, we are able to effectively bounce off the walls. However, for this curved wall, the ball won't bounce off. Instead, it just starts rotating in all directions.

Do physics materials not work on curved walls?