Structure block will not detect corner block

I have a world where I build my structures and two of the structure blocks that I use for buildings are detecting, but a third structure block used on another structure will not detect the corner blocks at all. I have attached my world to this ticket. It is the middle structure named "OakwoodManorV4" that is unable to detect corner blocks. The other two structures worked fine as you will see the structure block borders have outlined them perfectly.