Automatic secure password created by iOS filling in the Old Password field

Good afternoon. Recently I’ve had the experience of wanting to change my password on Discord. I wanted to change the last password I had to something much stronger using iOS’s automatic strong password creation. Unfortunately, I encountered a bug that filled in the Old Password text field, as well as the new one with this newly generated password. This meant that I couldn’t delete what was in the first field without deleting the newly generated password as well. If there’s a way to differentiate the text fields from each other so that the system recognizes which field to put the new password in, I would be very grateful.