Reflection in Blocks

The reflection of objects look different when they are in a block. When I explode a block the objects reflects other parts of the environment than when I make them into a block. Somehow Rhino doesn’t properly understand the position of the objects when they are in a block and the blocks reflect the environment in an incorrect manner. This must be som bug i guess.
This problem concerns the rendered preview.

Hi Simonk- I see this, thanks.