Nope. My lens is silent, on or off the camera.
That's quite curious. To my knowledge, you are the first to explicitly confirm that their XF 90 does not have something clunking around inside the lens when it is not attached to the camera, or the camera is turned off. In fact, in another forum, someone claimed to have a statement from Fuji Germany that this noise is "normal behaviour". To me, that either implies that your copy is aberrant, or that this noise is not that normal after all.