2 Sector Gs available - but single leg has none?

Hi all,

Quick question regarding how Gs are divided up on single legs and 2 sector flight.

I'm looking at HKG - LHR for the 1st March. No G's are showing. However, when I search HKG - JFK (which routes through LHR), I get the option for Gs on both sectors. Does this mean there are Gs floating around on that flight? Once again the mystical world of Gs has befuddled me...!

i'd think VS can create Gs for a two-leg route separately from any it creates on any single leg