I have the exact same issue.
peterwarbo
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Wow that's pretty incredible this bug snuck into iOS 18.
I would also like to know that.
Figured out I also had to had indexes for modifiedTimestamp to be sortable.
I figured out what was causing this error. I hade previously set com.apple.developer.icloud-container-environment to Production. When I deleted this it worked fine.
I have no answer unfortunately but would like to know if you solved this somehow?