QOpenGLWidget using OpenGL 3.3 Core Profile on Mac generates OpenGL Error right before calling paintGL

To reproduce (see included OpenGLWidgetTest.zip)

• Create a QOpenGLWidget as a child for another QWidget.
• Set its QSurfaceFormat to use OpenGL version 3.3 Core Profile.
• Set everything up to draw a triangle.
• Now no triangle shows up, and calling glGetError() first in paintGL() returns GL_INVALID_OPERATION.

The included stack trace is generated using the Apple OpenGL profiler and points out that the error is generated by a glViewport call, called indirectly by QOpenGLContext::makeCurrent()

Using a QWindow with manually setting the surface type to be an OpenGL surface does enable proper rendering using OpenGL 3.3 Core Profile.
(The included QWindow example is from http://github.com/advancingu/Qt5OpenGL, adapted to work with OpenGL 3.3 Core on Mac).

However I suppose QOpenGLWidget should work fine and using QWindow is not an option as our actual application that we're trying to build involves a far more complex UI than a simple OpenGL window.