I have 2 parts that spin around a center part, held by a rope constraint, The center part is anchored and moves with TweenService, when I run the game, The part spins like normal, but when I play it, one of the parts just stops.
This is how the parts move when i run the game:
Sounds like a physics sleeping issue as it is involved with constraint physics try following the below steps to debug this kind of problem:
This is due to an active bug where replication fails on a part constrained to an anchored part.
(report here: Physics parts attached to anchored part by ropes during tween not updating until tween has finished - #6 by The_Sink)
You can work around this for now by using TweenService/ setting CFrames on the rope’s attachment WorldPosition, rather than the anchored part.
The anchored part does move, its the unanchored parts that dont, they snap to the correct position when the tween stops, and they even start spinning like they should.
Yes, move the attachment connected to the anchored part instead.