File retention tags not showing after configured

Nextcloud version : 15.02
Operating system and version : Ubuntu 16.04
Apache or nginx version : 2.4.18
PHP version (eg, 7.1) : 7.0.2

The issue you are facing:

Once configurered, using these steps :

Unfortunately, once configured, the tags are not showing in retention parts, so it’s impossible to edit or remove them.

Thanks for futur help.