Similar problem here. Fresh install of buster on a thomson neo14-32wc, gnome edition.
There is gnome-wayland and gnome-xorg. In gnome-wayland it works fine : session is in tty7, I type ctrl-alt-f2 to 6 and back to ctrl-alt-f7 and get my gnome-session back. In gnome-xorg however, the gnome-session is killed. Not at once. Starting from tty7, I type ctrl-alt-f6 (for instance) and ps and gnome-session is still there. Then I type ctrl-alt-f7 and the session is killed and I end up on the gdm3 login (in tty1). Any help appreciated.
