By "intended" I of course meant the intended balance, since modelers don't really confer with the balance team regarding the displayed properties in the mesh so there are a lot of models which 'look' like they should have a different number of hardpoints or a different set of equipment, while they don't. So yea... That ship was modeled to be a 12-gunner battletrans but the balance for it was decided to be of a 10-gunner battletrans to add a bit of variety to the ships IMG can use above 75%, instead of giving them 3 Shire-clones of nearly the exact same stats and properties.
Regardless of that, the current IMG battletransport having 10 guns is not a bug, and spaming bug report threads about it would not help even one bit. I'd personally suggest IMG players use that ship for a while and once they're used to it, post a thread in balance discussion subforum if they still believe it should become a 12-gunner battletrans (which IMG already can use 2 different clones of - Shire itself and the Uruz - both at 90%).