I made a world and turned doMobSpawning off, butt the Wandering Trader still appears.
HOW TO REPRODUCE
Make a world and run the command "/gamerule doMobSpawning false".
Just wait for it, and eventually, the Wandering Trader should spawn somewhere.
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Thank you for your report!
We're actually already tracking this issue at MC-143420, so we will resolve and link this ticket as a duplicate.
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