So, I was playing around with structure blocks for the first time, and one of the things I decided to duplicate was a house I made. (I was using a load block, and I had saved the structure with the corner block technique.) I decided to duplicate it in the air. I successfully duplicated it, but when I went into the house, the bubble columns that I had been using to get between the first and second floors had overflowed. The water had somehow gone through the signs that I was using to hold the water, but the signs were still there! (The signs were dark oak, and had no writing on them.) There are some screenshots of my house, the not overflowing bubble columns, and the overflowing bubble columns.