Question Polygon Collider 2D behaving differently in IOS App

I have created a prefab which is square with rounded corners. The attached components are Rigidbody 2D and Polygon Collider 2D. A Physics Material 2D is used for both components with Friction: 0.4 and Bounciness: 0. Multiple of these prefabs are dropped from the top of the screen and collide with each other at the bottom of the screen and stack on top of each other.

• On Android devices, it's working as expected. There is no bounce and when the objects are done falling they don't move.
• On IOS, with the same settings, the objects bounce a bit and after done falling they continuously move and shake slightly. Multiple times this is causing the object to merge together.

 

I'm having the same problem. Using Unity as a Library, I have two square RigidBody2Ds, with one being a player, both having BoxCollider2D. On Android or macOS preview the squares fall and land on platforms, on iOS they bounce into the sky!

Am I doing something obviously wrong here? No scripts were created.

I didn't have this problem with Unity 2021 LTS but I do with 2022.2 and 2023.1. But since UaaL requires 2022 for Android I upgraded and can't find a solution to this problem anywhere.

 

did anyone solve it? this is ridiculous. It works as intended in the simulator and on Android: the boxes land on the ground. but on iOS the colliders fall through each other (see video)

- Unity: 2022.2.16f1
- Ground has a static RigidBody with a Box Collider 2d and a standard 2d material (0.4, 0)
- Boxes have dynamic Rigidbody 2d with continuous collision detection (also tried the discrete option) and a material (0.4, 0.1)

 

What I ended up doing is to set a ground collider as kinematic and freezing all the coordinates (before it was static)

There are a few good links that explain different behaviors:
How to stop falling through floors and colliders in Unity – John Stejskal : Software and Game Developer
https://diegogiacomelli.com.br/apps/collider-interactions/

What is not explained anywhere, though is why the hell it has problems only on iOS...

 

I have exacty this issue, too - works fine on other builds except iOS/XCode, where the colliders appear to stop working correctly. Is it a known bug that I should wait for an update, or is there a way around it?

 

Thanks for the update and apologies for the lack of description.