An issue with soft returns embedding before paragraph tags in Structured framemaker 22

When importing xml into Structured FrameMaker 22, a soft return is embedded before the paragraph tag, pushing heading to the next line.

It should look like this:

In the xml xml:space="preserve" has been added because a tag is included in the xml:

<mainhead xml:space="preserve">Average annual total returns (%) <emphasis role="submainhead">(See important legal information)</emphasis></mainhead>

If I remove xml:space="preserve" , it eliminates the soft return but it does not recognize the tag, so the tag is not applied.

Microsoft CoPilot created  a script to remove these soft returns, but it is not working when I run it.

Any help resolving this will be appreciated.

Here is the script:
 

#target framemaker

function removeSoftReturnsInMainhead() {
    var doc = app.ActiveDoc;
    if (!doc.ObjectValid()) {
        alert("No active document.");
        return;
    }

    var pgf = doc.FirstPgfInDoc;
    var count = 0;

    while (pgf.ObjectValid()) {

        if (pgf.Element.ObjectValid() && pgf.Element.GI === "mainhead") {

            var tr = new TextRange();
            tr.beg.obj = pgf;
            tr.beg.offset = 0;
            tr.end.obj = pgf;
            tr.end.offset = Constants.FV_OBJ_END_OFFSET;

            var text = doc.GetText(tr);

            if (text && text.indexOf("\r") !== -1) {

                // Clean up soft returns
                var cleaned = text

                    .replace(/\r|\n/g, " ")
                    .replace(/\s+/g, " ");

                doc.SetText(tr, cleaned);
                count++;
            }
        }

        pgf = pgf.NextPgfInDoc;
    }

    alert("Done. Updated paragraphs: " + count);
}

removeSoftReturnsInMainhead();