QT::SP_MediaSkipForward incorrect in Linux

QStyle::SP_MediaSkipForward returns the same icon than QStyle::SP_MediaSkipBackward. It's not happening in Windows environment.

The source code related to the attachment:

actionFirst=new QAction(tr("First"), toolBarTop);
toolBarTop->addAction(actionFirst);
actionFirst->setIcon(style()->standardPixmap(QStyle::SP_MediaSkipBackward));

actionPrevious=new QAction(tr("Previous"), toolBarTop);
toolBarTop->addAction(actionPrevious);
actionPrevious->setIcon(style()->standardPixmap(QStyle::SP_MediaSeekBackward));
//actionPrevious->setEnabled(false);

actionNext=new QAction(tr("Next"), toolBarTop);
toolBarTop->addAction(actionNext);
actionNext->setIcon(style()->standardPixmap(QStyle::SP_MediaSeekForward));
//actionNext->setEnabled(false);

actionLast=new QAction(tr("Last"), toolBarTop);
toolBarTop->addAction(actionLast);
actionLast->setIcon(style()->standardPixmap(QStyle::SP_MediaSkipForward));