Warnings on UsdPhysics.ArticulationRootAPI.Apply(prim)

When I run:

UsdPhysics.ArticulationRootAPI.Apply(prim)

In an extension, I get these warnings:

2023-09-23 12:55:19 [165,650ms] [Warning] [omni.physx.tensors.plugin] Cannot assign transform to non-root articulation link at '/slider'
2023-09-23 12:55:19 [165,650ms] [Warning] [omni.physx.tensors.plugin] Cannot assign velocities to rigid body at '/slider'

When I run it from the script-editor, I don’t see any warnings. AFAIK everything works fine either way.

BTW, if the prim is null then Isaac Sim crashes. Not sure if you guys want go guard against this kind of thing or not.