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Yes, I did that in purpose. Some people may have no intention to use object group, so new object is added with no group. But after that, the program will no longer manage the object automatically, because you may not want any groupless object in the list. If you like, you can drag out the object to make it groupless before you delete the group.
An object can appear in different groups. I make this possible because I think user may want to group the same objects in different ways and keep that available at the the same time.