I recently started a camp expansion and upgraded a Fireplace with large stones and made an Oven.

Upon server restart the Fireplace / Oven reverts to a state before the oven is built:
Fireplace with stone ring around it.

Create fireplace, Add 8 large Stones, Create Oven, Add cooking Pot then restart server.

Upon leaving the immediate area the fireplace disappears like it is loot:

Create Fireplace, Add 8 Large stones, Build oven, Add Cooking pot and walk out of the immediate area then return.

My understanding is this item is to be persistent and should not act this way.