The bug is exactly the same as on both Eilton Horizontal Partition and Eilton Vertical Partition. Everything is explained in pictures. The first image from the top is a description of the bug, the second is how it should look when fixed. The rest of the images are supplementary.
My general feedback on houses/manors: https://www.naeu.playblackdesert.com/en-US/Forum/ForumTopic/Detail?_topicNo=63692&_opinionNo=0