ldap querries are not paged? Windows Active Directory

case:

java code

forest Active Directory in 2016 version, one parent, two children

java code querrying root domain (parent) for group (universal) in child1 domain

group has got members from child2 domain

uri ldap://parent

only first 1000 members are returned

ldap policy for returning 1500 objects means that 1500 will be returned, paging is not working

possible reason? referrals are not paged so it is prevention against resoure exhaustion of querried domain controller - I've seen it in Technet, but... I can't remember where... maybe on Oracle JNDI?