After logging into my Minecraft Realms server, I've encountered an issue where previous activity (ie. building, digging, etc.) has been reset to a world state from a few hours prior.

I had been removing large portions of dirt, chopping down a section of a forest, and adding large sections of dirt to a nearby area, and then I had logged off. I do not know if anyone else was on the server in the period following my log off, but as soon I relogged on to the server all of that progress had been reverted to a previous world state.