Missing modified_crafting_slots quantity in recipe endpoint

It seems the result returned by the following endpoint doesn’t include reagent quantity: https://eu.api.blizzard.com/data/wow/recipe/46700?namespace=static-eu

I can find the quantity for Artisan's Mettle under reagents, but it seems to be always zero. For other modified_crafting_slots, there are only slot types, the number of required items is missing, for example Obsidian Seared Alloy.

Is the required item quantity supposed to be returned by this endpoint?

{'_links': {'self': {'href': 'https://eu.api.blizzard.com/data/wow/recipe/46700?namespace=static-10.2.5_52554-eu'}},
 'id': 46700,
 'media': {'id': 46700,
           'key': {'href': 'https://eu.api.blizzard.com/data/wow/media/recipe/46700?namespace=static-10.2.5_52554-eu'}},
 'modified_crafting_slots': [{'display_order': 0,
                              'slot_type': {'id': 84,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/84?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Obsidian Seared Alloy '
                                                    '(DNT)'}},
                             {'display_order': 1,
                              'slot_type': {'id': 82,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/82?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Primal Molten Alloy '
                                                    '(DNT)'}},
                             {'display_order': 2,
                              'slot_type': {'id': 111,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/111?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Infuse with Power'}},
                             {'display_order': 3,
                              'slot_type': {'id': 125,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/125?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Customize Secondary '
                                                    'Stats'}},
                             {'display_order': 4,
                              'slot_type': {'id': 123,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/123?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Add Embellishment'}},
                             {'display_order': 5,
                              'slot_type': {'id': 124,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/124?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Quenching Fluid'}},
                             {'display_order': 6,
                              'slot_type': {'id': 93,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/93?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Illustrious Insight'}},
                             {'display_order': 7,
                              'slot_type': {'id': 247,
                                            'key': {'href': 'https://eu.api.blizzard.com/data/wow/modified-crafting/reagent-slot-type/247?namespace=static-10.2.5_52554-eu'},
                                            'name': 'Spark'}}],
 'name': 'Obsidian Seared Slicer',
 'reagents': [{'quantity': 0,
               'reagent': {'id': 190456,
                           'key': {'href': 'https://eu.api.blizzard.com/data/wow/item/190456?namespace=static-10.2.5_52554-eu'},
                           'name': "Artisan's Mettle"}}]}