Hi there, I have the same problem. I did not solve it but found a work around. My MAC Studio (Ventura) has the same problem. Rekordbox does not read any formatted (Fat32) USB3 sticks (Scandisk Extreme PRO's). But... it does recognize my external harddrive (USBc). By the way, Venture does see the USB3 sticks. It's only Rekordbox that is blind.
Export via external HD works. This is not a solution however. I've posted this problem today.