Digimon Story Cyber Sleuth: Complete Edition - Level 22 of NX Digimon requires 0 EXP

The NX Digimon you get from the NPC outside the Detective Agency have an extremely erratic EXP curve. At first, it steadily increases from 63 to 3936 per level from 2 to 19, but then jumps to 25616 for level 20, then down to 7975 for level 21 and 0 for level 22, meaning you jump directly from level 20 to level 22, skipping 21 completely.