On a freshly updated Ubuntu 18.04 (Gnome 3.28.2), I used Gnome tweak tools to move window buttons to the left (
'close,maximize,minimize:'). All applications seem fine, except Nautilus where the buttons disappear when I maximize the window. Restarting the shell with Alt+F2, r does not help.
It is fully reproducible and does not occur when the buttons are on the right-hand side (see the screenshots).
EDIT: The question is obvious. What should I do to display the buttons on the left when maximized?