Puck.js digitalRead() on D30

Hi,
Just tried to verify the state of a GPIO (D30):

>pinMode(D30,'output')
=undefined
>getPinMode(D30)
="output"
>digitalRead(D30)
=0
>digitalWrite(D30,1)
=undefined
>digitalRead(D30)
=0
>getPinMode(D30)
="output"
>digitalWrite(D30,0)
=undefined
>digitalRead(D30)
=0
>digitalWrite(D30,1)
=undefined
>digitalRead(D30)
=0
>

I probed the pin, it actually goes high and low according to digitalWrite. Anyone knows why the state cannot be read by Espruino?