Mark Twain Steamboat Room Furniture Issue

#1
I don't know if it's just this room, but I found there's a section of the Mark Twain Steamboat room that doesn't allow me to configure furniture after placing it. I've added a screenshot-- it seems to only affect one area of the room.

I plop something in that Bermuda triangle, and it stays there unless I use the "clear room" function.
 
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