[REG 4.3->4.4] Cannot refactor to camel case because "replacement text is unchanged"

Refactoring all caps global variable into camel case (using RMB -> Refactor -> Convert to Camel Case) does not work in this code example:

#include <QString>
#include <QDebug>

const QString SOME_CONSTANT = QStringLiteral("Foo");

int main()
{
    qDebug() << SOME_CONSTANT;
}

"Replace" button is disabled, and tooltip says:

Cannot replace because replacement text is unchanged.

Although suggested replacement text "SomeConstant" IS different from original "SOME_CONSTANT". Or I misunderstood something?

Please see screenshot attached.