Why is Port scanner disabled by default on the default Scan Configs for Debian/Ubuntu distros?

GVM versions

gsad: 21.4.1~dev1
gvmd: Greenbone Vulnerability Manager 21.4.3~dev1~git-a8a9bbd0a-gvmd-21.04
openvas-scanner: OpenVAS 21.4.2~dev1~git-0534359a-openvas-21.04


Ubuntu 20.04

Hello everyone. I have a question as to why is the scan config “Full and fast” has “Port scanner” disabled by default. Previously when I would do my scans, I would received “0.0 (Log)” when my scan finished which confused me. After sifting through the web, I found another user of Debian/Ubuntu had their Scan Configs showing “Port scanner” like so:

I had to make a clone to edit the Scan Config and presto, it scanned! And, another question to be thrown in here is how would one either create/copy a pre-existing Scan Config to make modifications? I would appreciate any documentation to do this.

Thanks again for the help.