Thanks for the steps to reproduce the OB bug. It makes it much easier to track things down.
Large and Super Large critical tables work the way they did in v1.8, at least so far. They are in the RM Tables under Criticals - Arms Law/Claw Law and when resolving an attack by right clicking the entry on the attack table it will show options for Large and Super Large criticals to the left and upper left in the radial menu.
Eventually I plan on having those 2 critical tables along with the critical reductions automatically selected based on the field on the NPC sheet.