[Possible bug] OpenGL contexts/viewers are recreated when switching workspaces on Gnome

The behavior of QOpenGLWidget under Gnome is unexpected, and possibly a bug.

When I have one or multiple QOpenGLWidgets rendering on a window in a QApplication and I switch to a different Gnome workspace (with Ctrl+Alt+<Up/Down arrow>), the application does not seem to care.
However, when I switch back to the workspace where the application resides, the QOpenGLWidget::initializeGL function is called for all viewers, as if they were being destroyed and recreated. Is this expected behavior ?

Here's a little more info about my particular setup :

• Ubuntu 20.10
• Gnome 3.30
• Qt 5.14.2 (installed from APT)
• No particular configuration of Gnome, all stock
• Using libQGLViewer for rendering (which only inherits QOpenGLWidget and adds camera controls and a few utilities)

This behavior happens when switching to different workspaces, not when enabling the 'Exposé-like' view by pressing on Super. The re-building of the widgets happens when switching back to the workspace the widgets are on, and there's a couple of frames of where the OpenGL widgets only render black when the re-building happens.