Chinese Jet fuel has an incredibly low (better) freeze point than Jet (-40C) or Jet A-1 (-47C). At THAT temperature (better than - 50C) how would the GE system perform?
GE matters aside, it is interesting that both roll back aircraft (Delta and British Airways) were uplifted in China.
During the NTSB testing, they discovered that ice is stickier and more troublesome not at the lowest fuel operating temps, but in the bottom third of the typical range for the flight profile. The lower freeze formulation of that particular fuel moved the range into the area of concern.
I remain perplexed as to how this was missed during the airframe fuel system & engine certification and design paths and why the problem has remained hidden until now.