Flown it.
That's why every time you do mant actions that require anything to do with gear or related systems on the ground you have to put gears pins in. Weight o wheel systems are rare & don't work if fitted.
The maintainers have proven a number of times that if you put the gear handle UP and tricked the WOW switch for some unrelated reason, yes indeed, the nose gear will retract upon application of hydraulic power.
According to these posts, the WOW systems are rare, dont work, and/or can be tricked...?!?!?!
EDIT: Just curious about this as we use WOW coding in some automated flight procedures for both DEP and ARR...perhaps this is why some systems are active with WOW, and others are active at 400' AGL?