I'm playing in a superflat world with the "doMobSpawing" gamerule set to false but the Wandering Trader and his Llamas still spawn.
I don't know if this is only for superflat worlds or for all worlds.
[media]The white lines you can see are Structure Blocks by the way.
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Thank you for your report!
However, this issue is a Duplicate of MC-143420.
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