Mobs spawned from Ominous Trials drop their equipment

Mobs spawned from Ominous Trials are not supposed to drop their equipment.

I experienced this in a survival world when I did some ominous trials in a trial chamber. The mobs would drop their equipment (swords, bows, and armor) when killed. They would also drop their equipment in order pick up other equipment such as a better sword (not sure if this is intended either).

I have pictures of the equipment I collected (note the armor trims, enchantments, and damage)