REST group search does not return all the groups in Crowd

When searching for groups via the REST API wiht the following URL

search?entity-type=group&restriction=active%3dtrue

only the groups of the 1st directory defined for the connected client are returned.

If there are more than one directory linked to the connected client, groups from the 2nd/3rd/4th/... are not returned by the REST call.

Can you confirm this is a bug ?

Thx