General advice: If you don't follow flight directors, switch them off.
Lets say you keep flight directors and descend below your target altitude in the FCU.
A/THR and F/D will then command climb power while you're descending because of ALT*.
Hello overspeed of flaps and gear (tried it with a captain who didn't believe in disconnecting F/Ds on a visual approach) - only instant idle on the thrust levers saved us from the alarm clock and a meeting with the chief pilot.