Window surface FBO can become unbound when mixing QPainter and raw GL commands

void MyWidget::paintEvent(QPaintEvent *e)
{
    QPainter painter(this); // bound fbo is set to window surface's fbo
    painter.beginNativePainting();
    fbo->bind();
    glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    fbo->release();  // returns bound fbo to 0
    glClearColor(1.0f, 1.0f, 0.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT); // renders to raw context surface, not fbo
    painter.endNativePainting();
}