Delivery Content v2 : fetch don't return the children of a node

Questions
1

Hi,

I need the children of a node. The children are published.
I use this request, but

http://gxfdfdf.dfdfererfdf.it/umbraco/delivery/api/v2/content/?fetch=children:db60f7f7-dd2b-49ce-94e0-305991735acc

but the response is:

{
    "total": 16,
    "items": []
}

Why?
Thanks.

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/114336-delivery-content-v2-fetch-dont-return-the-children-of-a-node