Lost box containg mats and Map room!

Game mode: [Online
Problem: large wooden box dissapeared, had my map room, and a lot of bricks, walls, ceiling, shaped wood, iron supports
Region: North american server 3530

This is nuts, it took hours to gather those materials, and even more effort to build the map room. I hadn’t placed it yet as i was having issues setting it down.

Steps on how to reproduce issue:

I also had this issue. I built a vault and a map room. I placed map room in the vault and I logged out. When I logged in the next day, my vault and everything inside was gone. PVE mode.