lost operation in realm

I lost about 20mins operations in the realm. Around 11pm pct I and another friend logout after played in his realm. When i back in hours later i found both our buildings are gone. Anyway, it seems like the server didn't save when we logout.

I don't know is it a internet issue or a server glitch, but it is really a very serious problem for the people who do creations in Minecraft like me. Please give me a response. I don't want to see my architecture that spent me hours gone for no reason. If it happens again I will consider use private server to do multiplayer works in future.

 

thanks