Creations disappeared on login to world (creative mode)

I built a pixel art of Patrick star and a few other creations that had mobs in it, and I turned off Xbox. The next day I went to my world and I was in the same position as I left, however, my creations were gone, but not the mobs in it, they were still there. (It was only the creations I built that day) (photo where mobs such as blazes did not have the structure I built and nearby the creeper was Patrick)