Couldn't retrieve item name, description and lot of data since migrate to the new API

I have an app who permit to search item by name in database and display the stats.

It was working fine until the migration to the new API.

I update my requests to use the new API, but the return are incomplete.
Are missing lot of informations like the item name, or item description when I make a request by itemId like :

Is it normal ? how can I retrieve theses informations to make working my app again ?