It's not the case with a rocket, unless you're flying forward with a liquid propellant rocket and the fuel tanks are almost empty so that the center of mass is significantly behind the center of drag (and the atmosphere is appreciable). That is an inverted pendulum situation.

Outside of atmosphere and/or at low velocities, there's no instability of this kind, and "flying backwards" (=landing) makes the rocket actually auto-stable (like with a dart), even if the time constants may not necessarily be meaningful for useful control here.