DuckX deletes spaces

[Kalzaver]

While using a lot of statements like this in docx document

if (str.contains("marker"))
{
    str.replace("maker", a1);
    r.set_text(str.toStdString());
}

I've noticed that docx document after saving loses some spaces in random places over the rows and paragraphs where's no marker words.
For example:

This is how it was -> Thisishowitwas

This happens when I use Qt6. Can't say if it's an actual bug or my code is running wrong.