Confused, firewalld suddenly replaced by iptables on centos7?

I could swear i was using the default centos7 firewall: firewalld as firewall for my server but after i could not login to openvpn anymore i noticed that port for openvpn was closed... but when checking firewalld config it should be open.

after digging around i noticed that iptables package was suddenly installed but i'm almost certain i did not do that.

so my guess us the plesk install did an update or something and suddenly installed and enabled the ancient iptables package.

i guess...

Confused, firewalld suddenly replaced by iptables on centos7?