Icon being plotted using this node export server is not expected one

[ametthapa]

I setup this node export server on our server. We followed the below steps while setting the server

Setup Steps

1. git clone https://github.com/highcharts/node-export-server.git
2. git checkout 7f5d512 (for version 2.1.0)
3. edited lib/server.js
   from

  req.on("close", function () {
    connectionAborted = true;
  });

to

 req.socket.on("close", function () {
    connectionAborted = true;
  });

as the connection was getting closed.
4. used node version 20.4.0 and provided env variables as:

export HIGHCHARTS_USE_MAPS=YES
export HIGHCHARTS_USE_GANTT=YES
export HIGHCHARTS_VERSION=8.0.0
export ACCEPT_HIGHCHARTS_LICENSE=YES
export HIGHCHARTS_USE_STYLED=YES
export OPENSSL_CONF=/etc/ssl

Also, we tried using 9.2.2 version of highcharts.
5. npm install
6. npm link
7. highcharts-export-server --enableServer 1 --logLevel 4 --allowCodeExecution 1

Actual behaviour

When using POST with input

{
    "type": "image/png",
    "scale": 2,
    "globalOptions": "{colors: [\"rgba(39,26,136,0.7)\",\"rgba(241,203,93,0.7)\",\"rgba(234,70,62,0.7)\",\"rgba(114,189,85,0.7)\",\"rgba(77,147,23,0.7)\",\"rgba(163,151,243,0.7)\"],lang: {thousandsSep: ','}}",
    "infile": "{chart: {renderTo: 'test me',height: 400,width: 600},exporting: { sourceWidth:950,sourceHeight:300,enabled:false,allowHTML: true,sourceWidth: 400,sourceHeight: 400,scale: 1},credits: {enabled: true},title: {text: ''}}",
    "callback": "function (chart) {chart.renderer.rect(0, 0,400,400, 8).attr({stroke: '#ccc',fill: '#fcfcfc',zIndex: 3,class:'dataSearchWidget'}).add();if (true == true) {chart.renderer.text('<span><span style=\"float: left;opacity: 1.0;class:fad fa-heart;\">'+String.fromCodePoint(parseInt('f004', 16))+'</span><span style=\"float: left;left: 0;position: absolute;opacity: 0.4;\">'+String.fromCodePoint(parseInt('10f004', 16))+'</span></span>', 40, 260,true).css({fontSize: '175px',color: '#4d545c'}).attr({zIndex: 4}).add(); }};(function(stringFromCharCode){var fromCodePoint=function(_){var codeUnits=[],codeLen=0,result=\"\";for(var index=0,len=arguments.length;index!==len;++index){var codePoint=+arguments[index];if(codePoint<=0xFFFF){codeLen=codeUnits.push(codePoint);}else{codePoint-=0x10000;codeLen=codeUnits.push((codePoint>>10)+0xD800,(codePoint%0x400)+0xDC00);}}return result+stringFromCharCode.apply(null,codeUnits);};try{Object.defineProperty(String,\"fromCodePoint\",{\"value\":fromCodePoint,\"configurable\":true,\"writable\":true});}catch(e){String.fromCodePoint=fromCodePoint;}}(String.fromCharCode));"
}

i was expected below image

but got

I am using paid version of font awesome of version 5.15.1. And duotone fonts are available in it. I am using thie very fonts and able to plot the expected icon when using specific class, but getting error using this server.

Question

Can you please help here in this problem and provide suggestion. Also, updating highcharts version from this 2.1.0 requires major change in input chartscript so that is also not the viable idea here.