Multiple times since the latest realms update on 10/30/19 the realms has not been properly saving. I will hit save and exit and then login later and my save point will be from way before. For example, I was mining, went all the way back to my home, got a bucket, filled my bucket, discovered a pool of lava, mined 4 obsidian, ran back to my house again, made an enchanting table and then started building anew structure. None of that saved. None of it.