On the "Dungeon-Players-One" map for White Plume Mountain in Tales from the Yawning Portal, there is a LoS wall missing between the door and the arrow slit in the room "1.12 12. Burket's Guardpost".
On the "Dungeon-Players-Three" map for White Plume Mountain in Tales from the Yawning Portal, there is an additional LoS wall that should not be there in room "1.22 22. Frictionless Trap". It crosses a pit.