Since the 1.09 update, some attachments despawn from constructed items after a server restart, e.g. attached pots and pans despawn from stone ovens. I'm using the stone oven as an example, but server logs indicate the problem is not limited to that.

In the server log, during storage load, this message appears:

!!! Inventory content reduced because of improper sorting, file offset: <hex offset>

Which is indicative of the problem. This happens on a vanilla server with pristine mission files (no existing storage on first start, no changes to mission files), no mods.