I found a way around, i load a unpatched ISO and battle save at the start of the battle in 1-2, then loaded the patched iso trough the battle save slot, the enemies are the ones in the vanilla RD, and makes 1-3 really hard cause you can't grind properly in 1-2, but i could experience the rest of the changes in other chapters, so it was a worth skip.Maybe the enemy deployment is causing a bug in some cases?