NC18 LDAP Users don't show up in "everyone"

Nextcloud version: Nextcloud 18.0.0
Operating system and version: Debian Linux 9
Apache or nginx version: 2.4.25
PHP version: 7.2.19
MYSQL: 10.1.38

The issue you are facing:
LDAP-Users don’t show up in user category “everyone”.
I’m able to log in via LDAP-User and use the cloud normally.
LDAP-Users show up properly in their LDAP synced groups.
I spun up my development system several times from scratch with the same effect.
Anyone having some ideas on this?

Is this the first time you’ve seen this error? Y

Steps to replicate it:

  1. Install Nextcloud 18
  2. Connect it to an LDAP
  3. Browse Users

The output of your Nextcloud log in Admin > Logging:

Clean log / No LDAP relating log-entries

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'passwordsalt' => '---',
  'secret' => '---',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => 'devtest.local',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '18.0.0.10',
  'overwrite.cli.url' => 'http://localhost',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '---',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'filelocking.enabled' => true,
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'instanceid' => '---',
  'updater.secret' => '---',
  'updater.release.channel' => 'beta',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'ldapIgnoreNamingRules' => false,
  'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
);

The output of your Apache/nginx/system log in /var/log/____:

"GET /ocs/v2.php/cloud/users/details?offset=25&limit=25&search= HTTP/1.1" 200 893 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36"
"GET /ocs/v2.php/cloud/users/details?offset=25&limit=25&search= HTTP/1.1" 200 893 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36"
"GET /ocs/v2.php/cloud/groups/LDAPtestgroupdev/users/details?offset=25&limit=25&search= HTTP/1.1" 200 1046 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36"
"GET /ocs/v2.php/cloud/groups/LDAPtestgroupdev/users/details?offset=25&limit=25&search= HTTP/1.1" 200 893 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36"

No errors present in error.log.