[0.15.16] [Harkonnen] Roboport desync

[DaveMcW]

Steps to reproduce:

1. Host this save in multiplayer:

roboport-desync.zip

2. Wait a few seconds for the roboport to run out of energy.
3. Invite a friend to join.
4. Desync!

[Harkonnen]

Your rocket_pm_r was my primary big test for multithreading and belts optimization, now this perfect small test, thanks reproduced successfully.
P.S: I particularly liked cloud background over darkness when you hover roboport with mouse.

EDIT: Fixed for coming release.