Here we go:
[attachment=0:4ebiks4s][/attachment:4ebiks4s]
Save the locations to file, clear the area, load file - first time it works, clear area, try to load again - no luck.
Actually I think the name of the action - "On change" kinda hints at this, since with the same file there's no change? But that doesn't sound like the expected behaviour.
Can someone confirm this and check if the events themselves are correct?