How do I solve the problem of "Server sent charset unknown to the client."?

@Sthopd wrote:

20180927 MySQl8012 Character set in Live site.jpg1005x368 160 KB

Hello,
How do I solve the problem of “Server sent charset unknown to the client.”?
I have newly installed the Matomo analytics site on my Production server.
On my production server, I get an error when creating the first site-to-be-analyzed by Matomo.
Error:
""SQLSTATE[HY000] [2054] Server sent charset unknown to the client. Please, report to the developers

I see that within many PHP-code pages of Matomo, the character set for database handling is set -hard coded- to UTF8 !
Please developer, change this -hard coded- setting into a flexible variable that every webmaster can maintain in the config-file (…\config\config.ini.php).
or change the -hard coded- content to the a modern character set variant, such as: utf8mb4 .

Any help would be appreciated.

Friendly regards,
Simon

Environment:
Matomo 3.5.1
MySQL 8.0.12 (different port)
PHP 7.2.7
IIS 10 webserver on Windows 10 pro OS

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