Processing level 2A vs 2Ap?

What is the difference between processing L2A vs L2Ap?




L2Ap are the pilot products generated by ESA until March 2018, after March, they are operational products (L2A). Please see:

OK, fine. But how do I determine processing level using Sen2Cor 2.5.5 ?
Somewhere in the GIPP file? Where?
Expecting level 2A but get level 2Ap.
From the output:
<GIPP_FILENAME type=“GIP_Level-2Ap” version=“2.5.5”>S2A_USER_MSI_L2A_TL_SGS__20151204T174534_A002350_T33VXC_N02.00</