I have a super flat world and when I'm playing inside it some wandering trader and llama trader spawn even though it's biome is the void
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If I understand it correctly no mob is supposed to spawn naturally in the void biome, which is why there are no monsters or animals spawning.
Therefore this report is likely valid.
Confirmed for 19w11a and 19w11b

Related to this, Wandering Traders also spawn on water and just Jesus hover there with their Llamas. 19w12b

can reproduce in 19w14a
I would say works as intended. They can spawn anywhere with in 48 blocks of the player.