When I was playing Minecraft Windows 10 edition with my friend. He left MY server/ world and it glitched him so he couldn't join back. I saved and quit tried to join back but it didn't let me so, I got off Minecraft and got back on, when I got back on the game everything seemed normal. I joined the game and then boom... Nothing was there except the natural stuff in the world, the place where we spawned is where our base was. The base was wiped the whole sever was wiped. I left the world and joined back all I saw was the same thing. I looked around and yea nothing was there. I reset my pc and joined back the world and there was still nothing. (It was lagging so idk if it was due to lag). I tried again and nothing. Be safe make sure you have a backup for the world. Hopefully it's just a glitch and it fixes or I get my data back from Minecraft.