We found a bug with the patch 6 that we are working on right now. This bug is causing issues with the saving of world data. We are working on an updated patch for this.
The second (not the first, so we missed it in testing) time a server starts up after Patch 6 some of the persistent world data is lost causing this issue. On official servers we keep data backups and are going to roll back the world data to this morning. Any progress made on your characters since then will not be lost, but anything built in the world will roll back to the state it was in this morning.
A big shout out to Artyom for helping us find the details of this issue as well as assisting other players with getting up and running. He has been a huge help!