Trebuchet still Disappearing

Game mode: [Online | Singleplayer]
Problem: [Bug | Performance]
Region: [US]

Forgot to mention this in previous post.
Trebuchets seem to disappear on their own after being constructed. Twice now I have built a Trebuchet, fired it, moved it, etc. On both occasions, it remained at least until I logged out, but was gone upon my logging back in the next morning. Building decay is set to off, nothing else missing or destroyed.

Steps on how to reproduce issue:

On our private server, I have frequent reports of wheels disappearing too. These are often placed on foundations, the foundations are still there. Reports suggest they vanish randomly, the shortest time I have been told was just 5 hours after being placed.