OpenGL 4.6 unable to set surfaceformat

[Reynolds]

This morning Ubuntu updated Mesa to version 20.0.8. Since this update Qt is unable to set the correct surfaceformat and it will always default to OpenGL 4.6. This leads to a segfault when trying to access any OpenGL function. I have confirmed that OpenGL runs correctly and I am able to select core profile 4.1 on other applications using GLFW.

I set the core format in my Qt application using:

QSurfaceFormat glFormat;
glFormat.setProfile(QSurfaceFormat::CoreProfile);
glFormat.setVersion(4, 1);

glFormat.setOption(QSurfaceFormat::DebugContext);
glFormat.setSamples(4);
glFormat.setSwapInterval(0);

QSurfaceFormat::setDefaultFormat(glFormat);

and use a pointer to the QOpenGLFunctions_4_1_core object to handle calls to openGL

When printing the version string using:

QString glVersion;
glVersion = reinterpret_cast<const char*>(glGetString(GL_VERSION));
qDebug() << "Using" << qPrintable(glVersion);

It will consistently print out:
"Using 4.6 (Core Profile) Mesa 20.0.8"

No, matter what major or minor version I set in the surface format. There is also no QOpenGLFunctions_4_6_core available to use instead. Is this a bug in Qt or am I missing a setting somewhere?

[Reynolds]

I forgot to mention that this was on Qt 5.10. Upgrading to 5.15 did not solve anything.