Update Gitlab with Ansible gets warning

We are trying to Update Gitlab (yum update, Gitlab-Omnibus) with Ansible, but we receive the following warning in the Gitlab
Installation output:

Warnings:
Environment variable LC_ALL specifies a non-UTF-8 locale. GitLab requires UTF-8 encoding to function properly. Please check your locale settings.
(there is no further Info about LC_ALL in the output)

The locale parameters on the Ansible Control station are actually the same as on the Gitlab Server.

locale
LANG=en_US.UTF-8
LC_ALL=

This warning does not appear when connecting from the Ansible control station to Gitlab Server with a ssh session and executing the update.

So this warning is somehow related to Ansible, but not sure from where exactly. I have disabled sending environment variable /etc/ssh/ssh_config on the Ansible control station.
As well as disabled accepting environment Variables in /etc/ssh/sshd_config on the gitlab server.

I debugged also the ansible connection and could see LANG=en_US.UTF-8 is used, LC_ALL seems not to be specified.

Any ideas are apreciated.
Thanks.