Just switched from plone.app.ldap to pas.plugins.ldap on Plone 5.2 for migrated site. Short story: users from LDAP do not show up in the Plone user management UI.
Plone LDAP settings:
LDAP schema:
Looking at the query in base.py of node.ext.ldap: all queries are like with a specific uid
when rendering the users management UI:
ou=resource,dc=contacts,dc=global (&(objectClass=inetOrgPerson)(uid=testsite)) []
The query supposed to list all users would be:
(objectClass=inetOrgPerson))
but not
(&(objectClass=inetOrgPerson)(uid=testsite))