EpiServer Image Selection Dialog - Specify root folder

Hello EpiServer Devs and Support.

After we upgraded to EpiServer 11.12.0 and starts using new cool image selection property (media component) developed by Grzegorz Wiecheć . It looks really great but just noticed one possible issue with this .  Previously we were specifying root folder for image selection.

However, roots folder now totally seems to be ignored . Using the normal way of specifying 

 public override IEnumerable<ContentReference> Roots => new List<ContentReference>
        {
            //root content reference
        };

Could  someone please confirm is this is a bug or no longer supported feature.

Many thanks,

Kashif