Nextcloud version (eg, 12.0.2): 18.01, been happening in 18.0 as well
Operating system and version (eg, Ubuntu 17.04): 18.04.2 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.29
PHP version (eg, 7.1): 7.2.24
The issue you are facing:
Contact information fields have disappeared from my NC installation.
!