It seems that I cannot trade with villagers outside my initial spawn radius after the latest update.
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Thank you for your report!
We're actually already tracking this issue at MCPE-45034, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature, to see if the issue has already been mentioned.
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Itβs the latest update to Minecraft PE on iOS. I assumed it was the beta version that should only be available under iOS. And using the search feature hasnβt worked for me yet. Iβm pretty sure Iβm late to write up every issue Iβve written.

iOS can't download a beta version due to Apple Store restrictions. I have taken the liberty of changing your affected version to 1.11.0, the latest update for iOS.
Could you confirm which version you are using? 1.12 (which you have chosen) is currently in beta and is not available on iOS.