Scott M expressed precisely :
Munch wrote:

I'm going with the first one because it looks too neat to be a mistake,
plus, it doesn't seem to want to be sucked up using my vacuum desoldering
station - but a bit of confirmation would be very nice!

The 2x3 set of pins are 0v and all there to hold the connector physically
rigid to the board. The pins are connected by tracks rather than being on one
big ground plane to avoid problems with heat running away when soldering.

Thank you Syd and Scott, much appreciated chaps