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In an interview earlier this week a Chinese official revealed that the problem during the July Long March 5 launch was related to an issue with “first-stage propulsion.”
The official only added that the investigation is “on-going” and that they intend to fix the problem because the Long March 5 is needed for China’s human and deep space programs.
The vagueness here suggests to me the possibility of some very fundamental problems that might be requiring a major redesign. That is a pure guess, however, and should not be taken very seriously.