Nvidia Optimus on 20.04: switching to Intel GPU works on Ubuntu Mate, but not on Ubuntu Gnome. Why?

I am trying to revive an old Lenovo Ideapad Z360 laptop using Ubuntu 20.04 LTS.

On Ubuntu Mate 20.04, I am able to switch from the Nvidia GPU to the Intel GPU just fine. However, on Ubuntu 20.04 (Gnome), switching to the Intel GPU doesn't work!! So my question is: Why does it work on Ubuntu Mate, but not on Ubuntu Gnome?

The problem is described in more detail here: https://askubuntu.com/questions/1232211/nvidia-optimus-on-20-04-switching-to-intel-gpu-works-on-ubuntu-mate-but-not-on

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