That's the only real problem with Bandcamp digital releases - possible different content as the time passes. As long as the tracks are just being added, this place does the following: submitting a new accurate tracklist (while possibly keeping the old one), price will be changed because yeah, the content is no longer the same, release date can be also changed or can be just put in the notes, not sure about this one (I guess if there's info when exactly the new tracks were added), new album entry won't be created. I can think of
this one atm. That's how's been done. I hope you got an answer.