When using the overload of CustomCollider2D.SetCustomShapes] that allows passing two NativeArray of PhysicsShape2D and Vector3 vertices, the physics shapes are constrained to only use consecutive vertice between shapes i.e. no unused vertex are allowed and will produce a console warning and not set the physics shapes.

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What happened?
[https://forum.unity.com/threads/2d-physics-in-unity-2022-1.1327701/#post-9411431]

How can we reproduce that?

The following code leads to an error: "ArgumentException: An invalid PhysicsShape at index 1 was encountered. The CustomCollider2D was not updated."

 
{code:java}
var shape = new NativeArray<PhysicsShape2D>(2, Allocator.Temp, NativeArrayOptions.UninitializedMemory);
var vertices = new NativeArray<Vector2>(8, Allocator.Temp);
vertices[0] = new Vector2(1, 1);
vertices[1] = new Vector2(1, 2);
vertices[2] = new Vector2(2, 1);
vertices[3] = new Vector2(2, 2);
vertices[4] = new Vector2(1, 1) * 2;
vertices[5] = new Vector2(1, 2) * 2;
vertices[6] = new Vector2(2, 1) * 2;
vertices[7] = new Vector2(2, 2) * 2;
shapes[0] = new PhysicsShape2D { shapeType = PhysicsShapeType2D.Polygon, vertexStartIndex = 0, vertexCount = 3 };
shapes[1] = new PhysicsShape2D { shapeType = PhysicsShapeType2D.Polygon, vertexStartIndex = 4, vertexCount = 3 };
_customCollider.SetCustomShapes(shapes, vertices);
shapes.Dispose();
vertices.Dispose();
{code}
 

EDIT: I've created and attached a case demonstrating the issue - Melv.