'articact lines' on Sentinel MSI L2A image after sen2cor processing

a S2 MSI L1C image was processed with sen2cor 2.3.1 and L2A product was generated ,but by inspecting the study area–a lake, artifact lines are found on the image. How to work out this ?

the original S2 data file is downloaded
Data Hub:S2A_MSIL1C_20170419T024901_N0204_R089_T51RTQ_20170419T024855.zip