Yunohost Installation, nginx main config not overwritten

When installing Yunohost for the first time on Debian, the installer message says

Your configuration files for : … nginx … will be overwritten !

But the file /etc/nginx/nginx.conf is not overwritten.

The Debian was not a fresh install and the nginx.conf file content was in conflict with the yunohost installation. [FAIL] Installation of Yunohost packages failed

Removing the custom file in nginx.conf solved the issue.

This issue is minor and easily fixable but could happen to someone else so I report it here.