Close to the last level! (I think there's like 2.5 more?)
Had this bug pop up inconsistently for me during dev, so you might be able to just reload the game and load the level fine. I never saw any testers report it so I dropped it to low-priority, but I have another year or so under my belt now so I'll crack the code back open and actually fix it instead of just sweeping it under the rug.