In Figure , we show the time evolution of population on the upper PES and the indicator of coherence constructed by different methods at the two initial momenta. In the low-energy case with k0 = 10 au (see Figures and), FSSH begins to deviate notably from the exact quantum results when the reflected WP component on the upper PES reenters the interaction region. The overcoherent wavefunction generated by FSSH 20 results in incorrect hopping probabilities between the two adiabatic states, leading to some errors for the reduced density matrix even if it is constructed consistently. CT-MQC is able to approximately predict the asymptotic population and indicator of coherence, but there are notable deviations during the dynamics. In comparison, BCSHcc perfectly recovers the exact results for both population and indicator of coherence.