Apparently if you die quickly enough in Inferno and you happen to re-enter the same Crypts session, the part of the map you uncovered before stays uncovered.

https://preview.redd.it/8qsgp4goywge1.png?width=769&format=png&auto=webp&s=8b918b37be16176a1a53c47b18b1ece0660a2198