plesk-12-0 directory is missing from /theme-skins on fresh Onyx installations

plesk-12-0 directory is missing from /theme-skins on fresh Onyx installations​

Onyx 17.5 latest MU
CentOS 7.4, 64-Bit​

On a fresh installation of Plesk Onyx including the "Skins and Color Schemes" extension during installation, the /usr/local/psa/admin/htdocs/theme-skins/plesk-12-0 directory will be missing after installation has finished. This makes...​