Whenever I place a painting, the painting disappears. Later, if I look towards x=0, z=0 in my world, you can see the paintings rise up out of the ground and rise into the sky at high speeds. Curiously, this does not appear to happen with the 1*1, 2*1, or 4*3 paintings, but does happen with the 1*2, 2*2, 2*4, and 4*4 size of paintings. This glitch started when 1.14 came out. I've made sure that there are no command blocks or functions that would teleport paintings in this way.