Referrer values not being tracked

[seanhawkridge]

Expected Behavior

When initializing with {includeReferrer: true} in the init options, I'm expecting to see a referrer and referrering_domain in the user properties for an event in Amplitude.

Current Behavior

Events are being logged, but the referrer and referrering_domain values are missing. I can't see these attributes in the json being sent to Amplitude in the network tab in Chrome either.

Steps to Reproduce

1. Add snippet from docs (here)

(function(e,t){var n=e.amplitude||{_q:[],_iq:{}};var r=t.createElement("script")
;r.type="text/javascript"
;r.integrity="sha384-6T8z7Vvm13muXGhlR32onvIziA0TswSKafDQHgmkf6zD2ALZZeFokLI4rPVlAFyK"
;r.crossOrigin="anonymous";r.async=true
;r.src="https://cdn.amplitude.com/libs/amplitude-8.18.4-min.gz.js"
;r.onload=function(){if(!e.amplitude.runQueuedFunctions){console.log(
"[Amplitude] Error: could not load SDK")}};var s=t.getElementsByTagName("script"
)[0];s.parentNode.insertBefore(r,s);function i(e,t){e.prototype[t]=function(){
this._q.push([t].concat(Array.prototype.slice.call(arguments,0)));return this}}
var o=function(){this._q=[];return this};var a=["add","append","clearAll",
"prepend","set","setOnce","unset","preInsert","postInsert","remove"];for(
var c=0;c<a.length;c++){i(o,a[c])}n.Identify=o;var l=function(){this._q=[]
;return this};var u=["setProductId","setQuantity","setPrice","setRevenueType",
"setEventProperties"];for(var p=0;p<u.length;p++){i(l,u[p])}n.Revenue=l;var d=[
"init","logEvent","logRevenue","setUserId","setUserProperties","setOptOut",
"setVersionName","setDomain","setDeviceId","enableTracking",
"setGlobalUserProperties","identify","clearUserProperties","setGroup",
"logRevenueV2","regenerateDeviceId","groupIdentify","onInit","onNewSessionStart"
,"logEventWithTimestamp","logEventWithGroups","setSessionId","resetSessionId",
"getDeviceId","getUserId","setMinTimeBetweenSessionsMillis",
"setEventUploadThreshold","setUseDynamicConfig","setServerZone","setServerUrl",
"sendEvents","setLibrary","setTransport"];function v(t){function e(e){
t[e]=function(){t._q.push([e].concat(Array.prototype.slice.call(arguments,0)))}}
for(var n=0;n<d.length;n++){e(d[n])}}v(n);n.getInstance=function(e){e=(
!e||e.length===0?"$default_instance":e).toLowerCase();if(
!Object.prototype.hasOwnProperty.call(n._iq,e)){n._iq[e]={_q:[]};v(n._iq[e])}
return n._iq[e]};e.amplitude=n})(window,document);

2. initialize Amplitude:

amplitude.getInstance().init(apiKey, null, {includeReferrer: true, includeUtm: true, includeGclid: true});

3. log an event:

amplitude.getInstance().logEvent('View Petition', {petition: window.location.pathname, scope: ['App'] });

Environment

• JS SDK Version: 8.18.4
• Installation Method: Snippet
• Browser and Version: Chrome Version 102.0.5005.115