Nextcloud 13: New Users/Groups do not appear in combobox if I try to share a folder

Dear All, this is the issue I face in the new nextcloud 13:

Nextcloud version : 13.0.0.14
Operating system and version : Ubuntu 16.04
Apache or nginx version : Apache/2.4.18 (Ubuntu)
PHP version : 7.0.25-0ubuntu0.16.04.1

The issue you are facing:
I added new users and new groups. After that I created a new folder and wanted to share this with the users. In the combobox of the share configuration the new users and groups are not found/displayed.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Create new user (and group)
  2. try to share folder or file with new user/group

The output of your Nextcloud log in Admin > Logging:

nothing specific

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

<?php
$CONFIG = array (
  'instanceid' => 'xxx',
  'passwordsalt' => 'xxx',
  'secret' => 'xxx',
  'trusted_domains' => 
  array (
    0 => 'xxx',
    1 => 'yyy',
  ),
  'datadirectory' => 'xxx/data',
  'overwrite.cli.url' => 'xxx',
  'dbtype' => 'mysql',
  'version' => '13.0.0.14',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'logtimezone' => 'UTC',
  'installed' => true,
  'loglevel' => 0,
  'maintenance' => false,
  'mail_from_address' => 'xxx',
  'mail_smtpmode' => 'php',
  'mail_domain' => 'leize.de',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => 'true',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'theme' => '',
  'updater.secret' => 'xxx',
);

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

nothing fitting. 

Best regards

Thorsten

remains the same after update to NC 13.0.1

PS: If I login with the new user id, then I only see the new users in the comboboxes.