I think I found the answer to our problem. Change Dynamic Range from Auto to 100, 200, or 400%. This worked for me, and the shutter speed now displays in Aperture Priority mode.
Good Luck
I have the same issue with the X-S20. The only way to get the shutter speed and aperture to display at the same time is in manual. Aperture priority = no SS display unless AEL/half press. SS priority = no F display. Other than wait for a Fuji rep response, have not figured out how to solve the problem either.