My gnome-shell seems to have only one workspace. I cannot switch to another workspace by using the Ctrl+Alt+Down/Up combination and using the Super Key always shows me one workspace only. If I attempt to open a program in a new workspace using the middle mousebutton i can observe there being 2 workspaces briefly but then the program gets moved to the upper one and the second one disappears.
I have already tried to use static workspaces using gnome-tweak-tool. This gives me multiple workspaces, but they all show the exact same content. They are not independent from eachother.
Furthermore I have found executing

compiz --replace

gnome-shell --replace

Gives me a gnome-shell with working workspaces.

Edit: Actually the workspace feature just disappeared as I opened a program. So scrap the part about it working.