The tag HandDropChances is "[0.085f, 0.0f]" instead of "[0.085f, 0.085f] on any mobs updated directly from 1.8.9 or before to 20w21a or later. This effects all mobs.

Similarly, The tag HandDropChances is "[2.0f, 0.0f]" instead of "[0.085f, 0.085f] and the tag ArmorDropChances is "[2.0f, 2.0f, 2.0f, 2.0f]" instead of "[0.085f, 0.085f, 0.085f, 0.085f]on certain mobs updated directly from 1.8.9 or before to 20w30a. This only seems to effect certain mobs.