QXmlQuery XSL apply-templates memory leak

#include <QCoreApplication>
#include <QXmlQuery>

auto transform =
        R"XSL(<?xml version="1.0" encoding="UTF-8"?>
        <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
            <xsl:output method="text" encoding="UTF-8"/>
            <xsl:template match="/root">
                <xsl:apply-templates select="*"/>
            </xsl:template>
        </xsl:stylesheet>)XSL";

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QXmlQuery query(QXmlQuery::XSLT20);
    query.setFocus("<root><test/></root>");
    query.setQuery(transform);

    return 0;
}

==3524== 712 (24 direct, 688 indirect) bytes in 1 blocks are definitely lost in loss record 199 of 211
==3524==    at 0x4C2B0E0: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==3524==    by 0x4FFF8C4: QPatternist::ParserContext::modeFor(QXmlName const&) (qparsercontext_p.h:344)
==3524==    by 0x4FF090B: QPatternist::XPathparse(QPatternist::ParserContext*) (querytransformparser.ypp:3621)
==3524==    by 0x4F4EF0F: QPatternist::ExpressionFactory::createExpression(QExplicitlySharedDataPointer<QPatternist::Tokenizer> const&, QExplicitlySharedDataPointer<QPatternist::StaticContext> const&, QXmlQuery::QueryLanguage, QExplicitlySharedDataPointer<QPatternist::SequenceType const> const&, QUrl const&, QXmlName const&) (qexpressionfactory.cpp:149)
==3524==    by 0x4F50E72: QPatternist::ExpressionFactory::createExpression(QIODevice*, QExplicitlySharedDataPointer<QPatternist::StaticContext> const&, QXmlQuery::QueryLanguage, QExplicitlySharedDataPointer<QPatternist::SequenceType const> const&, QUrl const&, QXmlName const&) (qexpressionfactory.cpp:123)
==3524==    by 0x4F00811: QXmlQueryPrivate::expression(QIODevice*) (qxmlquery_p.h:252)
==3524==    by 0x4EFE51D: QXmlQuery::setQuery(QIODevice*, QUrl const&) (qxmlquery.cpp:429)
==3524==    by 0x4EFF0D7: QXmlQuery::setQuery(QString const&, QUrl const&) (qxmlquery.cpp:448)
==3524==    by 0x400DC9: main (main.cpp:19)