[ababak]

1. Create a simple scene: two cubes positioned close to each other.
2. Orient camera so that part of one cube is hidden behind another one.
3. Assign matte material to back cube.
4. Assign high grade glass material to front cube.

What's expected: clear glass cube.
What I get: matte cube is visible through glass cube.

[ababak]

As I think a bit more, it looks like it is a correct behavior. Sorry for confusion.