Add a dependency graph relation Force Object Animation → Scene Rigid Body World Rebuild. This ensures that the rigid body world is rebuilt when a force object is re-tagged for animation updates. The extra relation doesn't add any new calculations when the animation is running, as the Time Source node already had a relation to the scene's `RIGIDBODY_REBUILD` node. The relation is created directly to the `RIGIDBODY_REBUILD` Operation. I would have liked to target the containing Component instead. However, that has the `RIGIDBODY_SIM` operation as entry node, which isn't enough to actually fix T80121. Reviewers: Sergey Differential Revision: https://developer.blender.org/T80121