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The internal elements and mechanisms of many lenses are at free-state and can move if the lens isn't attached to the camera or attached but the camera is off. Therefore, when you slightly shake the lens such as when removing from the camera or while in transport, the lens mechanism may move and produce sound. This is normal behavior that doesn't affect the lens performance and operation.
E-mount lens with a linear motor.
E-mount lens with a dynamic linear motor.