I found that this sensor can't stay as a ghostly image for long; it disappears in about 10 seconds. That's so quick that my construction robot hasn't had time to get there yet, which is really frustrating for me.
yes. I am planning to fix/change this as the "default timeout" for ghosts in the game is actually way longer (https://wiki.factorio.com/Ghost claims it is a "week of game time". I will match to this.
