When the Hocus Pocus target has been hit and is currently flashing in non-multiball mode, sometimes the ball will still drain down the outlane. I've never played a real table of Theatre of Magic before but is it supposed to be like this?
I have a real TOM table. When the Hocus Pocus feature is active (IIRC it is active for ~15 seconds by default - which can be configured in the setup) then the ball should not drain. Exception: the left magnet is less strong than the right and might not always have the ball locked in a precise position when the magnet is turned off - in these cases the ball might still be wobbling around the wand and can sometimes still drain.
I've played several ToMs over the years and while I can't say they've never missed a ball, their magnets are far more reliable than the ones in TPA.I can definitely hear the magnets activate, but most of the time the ball flies right through them. Or, as others have mentioned, the magnets activate after the ball has already passed by. But either way, they don't seem to be reliable. Maybe the intent was to make them like the real table, when they're also unreliable.