Usually when you create a object group with objects of the same kind there is this info pad:
“This group contains objects of the same kind (object type here)”
But if you add objects of the same type (that are NOT sprites), it will display something that I think it is their internal names.
If you add a single text object to the group, it will display:
“This group contains objects of the same kind (TextObject::Text)”
Object types I currently tested and are bugged:
Light object, nine patch, text object, tiled sprite.