Musk retweeted his own explanation on X, stating that the booster's green flame was linked to copper burning caused by fuel depletion in the regenerative cooling circuit and oxygen-rich main combustion chamber, as engine performance during the flight was slightly below expectations. He indicated that the optimization direction includes improving engine performance and consistency, as well as adjusting the flight software to advance MECO1 by approximately one second, leaving sufficient propellant for the return journey and landing. Relevant engine improvements are currently underway on Raptor V3.2.