Is it possible to create a text object temporarily to measure its size?

I am trying a scheme where to measure an object’s size in the middle of a calculation, using an async mechanism I send a request to Figma and it sends a response back. What I’m asking is to measure the size of a text object.

So I send all the data to Figma, create the object, and then try to read its width and height, send back the result. Here’s the code that does this:

function figGetObjectSize(genObj)
{
    const figObj = figCreateObject(genObj);
    
    const width  = figObj.width;
    const height = figObj.height;

    figObj.remove();

    figPostMessageToUi(
    {
        cmd: 'uiForwardToGenerator',
        msg: 
        {
            cmd:     'returnFigGetObjectSize',
            objectId: genObj.objectId,
            width:    width,
            height:   height
        }
    });
}

figCreateObject() eventually calls this function:

function figCreateText(genText)
{
    const figText = figma.createText();
    
    if (!genTextIsValid(genText))
        return figText;

    (async function() 
    {
        const fontName = 
        { 
            family: genText.font, 
            style:  genText.style
        };

        await figma.loadFontAsync(fontName); 

        figText.fontName      = fontName;
        figText.fontSize      = Math.max(1, genText.size);
        
        figText.characters    = genText.text;

        figText.lineHeight    = {unit: 'PERCENT', value: genText.lineHeight   };
        figText.letterSpacing = {unit: 'PERCENT', value: genText.letterSpacing};

             if (genText.alignH == 0) figText.textAlignHorizontal = 'LEFT';
        else if (genText.alignH == 1) figText.textAlignHorizontal = 'CENTER';
        else if (genText.alignH == 2) figText.textAlignHorizontal = 'RIGHT';
        else if (genText.alignH == 3) figText.textAlignHorizontal = 'JUSTIFIED';

             if (genText.alignV == 0) figText.textAlignVertical   = 'TOP';
        else if (genText.alignV == 1) figText.textAlignVertical   = 'CENTER';
        else if (genText.alignV == 2) figText.textAlignVertical   = 'BOTTOM';

        setObjectTransform(figText, genText);
        setObjectProps    (figText, genText);

        if (     genText.width  == 0
              && genText.height == 0) figText.textAutoResize = 'WIDTH_AND_HEIGHT';
        else if (genText.width  == 0) figText.textAutoResize = 'HEIGHT';
        else                          figText.textAutoResize = 'NONE';

    })();

    return figText;
}

The code is correct, because it works during normal functioning of my plugin, but when I try to use it like I do in the first function, I get the following error:

Error: in set_fontName: The node with id "511:14141" does not exist

What’s the issue here? Is the temporary text object not being created? Is figma.createText() async somehow?