I've just checked my USB stick with 25H2 on and I've got the same.
Seems like the USB stick has been partitioned.
Right click the start menu and go to disk management, right click on all the volumes and go to delete (make sure its on the USB stick).
Once all deleted right click again and click on "New Simple Volume", a window will appear, press next twice.
Select a drive letter, Press next and then select the file system (NTFS or FAT 32) and Volume label, press Next and then finish