Board Thread:Bug Reports/@comment-27785355-20160217230618/@comment-25565811-20160223091952

Samwise is right. If you want it to be hidden, you have to remove the light behind the door. Then it's perfectly tarned unless it's night, when a silver picture appears.

You can also easily spot the entrance of a dwarven house, as it is a square hole in the hillside, which doesn't appear naturally like that.