I have a crane model that I was trying to make when I came across this issue, and you can see my initial post on the Scripting Support section here.
Here’s a video showing the problem:
When I begin tweening the anchored part’s CFrame, the attached part freezes and does not unfreeze until the tween has finished. If the network ownership of the unanchored part is manually assigned to a user (or the user approaches the part and network ownership is automatically handed over), only that user sees the part moving. The server, as well as all other clients, view it as being stuck until network ownership is changed again or the part’s tween finishes.
Here’s the place file from the video: Baseplate.rbxl (22.4 KB)