Bug with QGraphicsOpacityEffect probably?

[Leon]

So I have a widget. Inside the widget there is a scrollarea..
If i try this:

@QGraphicsOpacityEffect* opacityEffect = new QGraphicsOpacityEffect(this);
opacityEffect->setOpacity(0.0);
ui->widget->setGraphicsEffect(opacityEffect);
QPropertyAnimation* anim = new QPropertyAnimation(this);
anim->setTargetObject(opacityEffect);
anim->setPropertyName("opacity");
anim->setDuration(3000);
anim->setStartValue(opacityEffect->opacity());
anim->setEndValue(1);
anim->setEasingCurve(QEasingCurve::OutQuad);
anim->start(QAbstractAnimation::DeleteWhenStopped);@

which always works with widgets, buttons, labels,etc
the whole widget will be black

You think i should report it as a bug?

EDIT:
This is like a scrollarea bug, cause it is the same with groupbox, stackwidget, etc

[Leon]

Reported here: https://bugreports.qt-project.org/browse/QTBUG-25650