  It was well known that most of gamma-ray bursts (GRBs) are dominated by
positive spectral lags, while a small fraction of GRBs show negative lags.
However, Wei et al. firstly identified a well-defined transition from positive
lags to negative lags in GRB 160625B, and then got robust limits on possible
violation of Lorentz Invariance (LIV) based on the observation. Recently, such
a transition has been found in three different emission episodes in \thisgrb by
Gunapati et al., which provides us a great opportunity to investigate whether
the transition results from LIV-induced observed spectral lags. Our analysis
shows that the LIV model can not be compatible with the current observations,
whereas, only the spectral evolution induced spectral lags could responsible
for the transition. So, spectral evolution can also explain the positive to
negative lag in GRB 190530A.
