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I’ve made the same observation on my19. Some rattle coming from the passenger seat area. Passenger or no passenger, the sound occurs, but not always. Only when moving, not stand still.
I need to listen to it some more. Today I figured to put some bass heavier music - rattle starts from the same area, nowhere else to be heard. When I remember I’ll try to put music and try some panels if I could locate the rattle.
Perhaps the noise you mention comes from the seatbelt height adjuster.
When driving on very rough roads, there is sometimes a rattling noise. It is usually heard on the driver's or front passenger's side, although I have had it happen on both sides. If I touch the belt adjustment lever button, the rattling disappears.
In the pre FL it already happened to me.
Apologies if I have not used the correct English terms.