RigidBodyVelocity is zero when using KinematicVelocityBased

[Occuros]

When using the RigidBodyType::KinematicVelocityBased rigid body type in bevy_rapier2d the RigidBodyVelocity.linvel seems to be always [0, 0] even when it is moving (by setting the velocity inside a system).

Modifying the velocity has the desired effect, but querying the current velocity doesn't provide the expected value.

If the RigidbodyType is switched to the Dynamic variant, the RigidBodyVelocity.linvel value is properly updated.