While doing '/summon Villager' there is a small chance that the output will be 'Summoned new entity.minecraft.villager.none' Resulting In a new villager without any special textures, wearing the simple brown robe I have been accustomed too and has no trades. Using the spawn eggs also got this second useless villager. I tried spawning Villagers in other biomes besides the plains and could not replicate, Guessing its a plains only bug