My friend and I have a survival world together which they are the owner of. After installing the most recent Minecraft for Windows update, I re-joined my friend's world, only to find that my entire inventory, previously containing all of my tools and resources, was empty. All of my experience points had disappeared too, with the bar displaying 0 Levels, and the dog I had tamed earlier could no longer be controlled to sit or stand when right-clicked. I was also spawned back in at the default world spawn, and it was like all of my progress in the world had been erased. I hope that this issue can be resolved.