Yes but you should NOT use it. If you save to less tiles you get this and some other problems. Noggit normaly mark all tiles you need to save (white squares in map view) and save all automatic. If you use the save current option some links mide be missing and you can get m2s with missing collision or doubld m2s after next save.Thats why I deleted it in 1.3. Its an error source.
The duplicaion bug is because of the unique ids (uid). This will be fixed in 1.3.