Also I'm sometimes getting this error randomly from calls to room.findExitTo():

 Error: Could not load world map data
    at loadGrid (/opt/engine/dist/game/map.js:22:15)
    at Object.findRoute (/opt/engine/dist/game/map.js:84:9)
    at Object.findExit (/opt/engine/dist/game/map.js:112:24)
    at Room.findExitTo (/opt/engine/dist/game/rooms.js:695:25)
    at Object.module.exports.run (hauler:67:42)

I am getting this too, I have tried move(), moveTo() with x and y, target, roomposition, and all of them are super inconsistent when transitioning between rooms, it is really annoying.
It seems to work better going from right to left than from left to right.