The "FD32" 32MB capability was only implemented on the last drives which could also use 240MB disks.
Maybe the earlier 120MB drive hardware could have been physically capable of it but the drive firmware did not support it.
Maybe the earlier 120MB drive hardware could have been physically capable of it but the drive firmware did not support it.
Eventually, right here, we'll all collectively remember the whole truth about the mysteries of this conglomerated and seldom-used removable media format.