In reply to Mical:
Right at the tip of the split (at the front of the toe box) it is open ever so slightly - where the 2 edges of the split are just butt-jointed together. Moving back up the shoe from here the rubber is overlapped and glued together.
On my totally unused pair I cannot see any material through the tip of the split line, but on my very well worn pair the split has opened slightly and you can see some material.
It looks to me like the rand/toe patch is made from one piece of rubber and the splits are needed to wrap the rubber around to fit the toe box's shape, so seems perfectly normal/intentional.