I'm envisioning 4 scenarios.
1) Was a noisy day at the office when Swen said "We need to cut a few levels of lair beneath phantom forest" and person who cut said content only heard "Cut lair beneath phantom forest"
2) It was a busy day at the office to get everything complete and content locked down when person in charge of cutting the content pressed the wrong button and deleted everything without noticing.
3) They really decided on purpose to cut the whole thing for whatever reason instead of just the few levels.
4) The dog ate it.
