[SU-289764] Snow Mining weirdness (zero mcg of snow??)

Ruby mined the bottom of a stack of 3 snow tiles.  I heard them collapse and happened to scroll by to see her endlessly mining the remainder with an ongoing cascade of 0 Snow flying from the object.  it only ended when another dupe mined the ice tile below.  Ruby then proceeded to carry 0 mcg of snow until she had a narcoleptic fit and dropped it.  the "snow" vanished..