Gtk3 to GTK4 Port: OpenGL Framebuffers

I am continuing the port of my application to GTK4 and am pleased with the progress so far (with thanks to ebassi).
My current problem is that I can’t manage to create OpenGL framebuffers (the same code in GTK 3 works). Now, in GTK4, the result of glCheckFramebufferStatus is GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT. I have poked around the OpenGL textures and attachments quite a bit and haven’t managed to understand what is going wrong. Maybe there’s something on the GTK side (Gtk3 vs GTK4) of which I am unaware?
Thanks,
Paul.

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