Hi,
Haven't seen this*), but considering that TestComplete creates both namemapping and alias entities when mapping the new object, I think that this was the case.
*) 'Haven't seen this' means that I always investigate why the parent object cannot be found when TestComplete suggests to re-map something and correct the problem so that the initial object can be found. But I seem to remember from the name-maps created by others that the _new suffix is added to the mapped name and the alias when the new mapped name coinsides with the already existing one.