It can certainly do a SC, but if it did not instantly happen, you then have 2 situations: solder is not loose (which is fine) and solder is loose, which may cause SC if you move the cell. Of course the not loose one can in theory get free and cause bad things; it's something that depends on the quality of the material used, where exactly it landed and the temperature it did at.
The area in Korishan's picture is usually a + area only, but there is the danger of reaching a border, where it can connect to the -.