Open door setting deletes some texture on wall.

[bc]

Hello, Whenever I final render a wall with a door that is open beyond 90? the texture on the wall which is within the selection handles is removed. It is somewhat like the door casts a texture removing shadow on the wall. The more the door is open, the more corresponding texture is removed. It happens in different documents and in diferent workspaces. Is this a bug or am I missing some setting somewhere? I didn't have much luck searching the site. Thanks. Bradley