I know it was bugged from the start being when personal debuffs expire and not when all debuffs expire, but man is it sad seeing the difference between the synergy before and after. It was so fun just gaining lots of power by parrying with the entire f4 synergy team (which could be argued isnt entirely practical) and now it only triggers from 1 debuff on his sp1 and sp2, or if the opponent uses a different special from the careful study one... or if you lose your prefight debuffs.
https://youtu.be/qcGPMWCD8Y8