systemTags is ignored when specified in the JS or JSON options

[na--]

Running k6 run -o json script.js with the following script:

import http from "k6/http";

export let options = {
    systemTags: ["proto", "url"],
};

export default function (data) {
    http.get("https://httpbin.org/anything");
}

produces results like

{"type":"Point","data":{"time":"...","value":116.683163,"tags":{"group":"","method":"GET","name":"https://httpbin.org/anything","proto":"HTTP/1.1","status":"200","tls_version":"tls1.2","url":"https://httpbin.org/anything"}},"metric":"http_req_duration"}`

while running the same script with CLI options (k6 run --system-tags=url,proto -o json script.js) works as expected.

This was first reported in the community forum by VladT. Somewhat connected issues: #768, #755