LDAP user (re)mapping - help needed

Steps to reproduce
1. Change LDAP server and basedn
2. add users with the same name, uid as before
2. reconnect

Expected behaviour
Users addressbook

Actual behaviour
Login is OK,
user files are here,
but no addressbook data (users have new UUID in LDAP)

Server configuration
Operating system: Gentoo Linux
Web server: Apache 2.4
Database: sqlite
PHP version: 5.6.30
ownCloud version (see ownCloud admin page): 8.1.1
Updated from an older ownCloud or fresh install: updated
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): LDAP authentication

ownCloud log (data/owncloud.log)

Integrity status for oC9+

No files in here

Can you add owncloud logs and perhaps apache logs from a try of showing LDAP data, please?