getInventoryItem and getInventoryItems responses are different for the availability key

I've discovered that the response structure of both endpoints are not the same for the inventoryItem.availability key.

This is an example for getInventoryItem response for the above mentioned key:

    "availability": {
        "pickupAtLocationAvailability": [
            {
                "quantity": 100,
                "merchantLocationKey": "somelocationkey_0",
                "availabilityType": "IN_STOCK",
                "fulfillmentTime": {
                    "value": 3,
                    "unit": "CALENDAR_DAY"
                }
            }
        ],
        "shipToLocationAvailability": {
            "availabilityDistributions": [
                {
                    "merchantLocationKey": "somelocationkey_0",
                    "fulfillmentTime": {
                        "value": 2,
                        "unit": "BUSINESS_DAY"
                    },
                    "quantity": 100
                },
                {
                    "merchantLocationKey": "somelocationkey_1",
                    "fulfillmentTime": {
                        "value": 3,
                        "unit": "BUSINESS_DAY"
                    },
                    "quantity": 100
                }
            ],
            "quantity": 200,
            "allocationByFormat": {
                "auction": 0,
                "fixedPrice": 200
            }
        }
    }

and this is the response of getInventoryItems request for the same SKU:

            "availability": {
                "pickupAtLocationAvailability": [
                    {
                        "quantity": 100,
                        "merchantLocationKey": "somelocationkey_0",
                        "availabilityType": "IN_STOCK",
                        "fulfillmentTime": {
                            "value": 3,
                            "unit": "CALENDAR_DAY"
                        }
                    },
                    {
                        "merchantLocationKey": "somelocationkey_1"
                    }
                ],
                "shipToLocationAvailability": {
                    "quantity": 200
                }
            }