I submitted a Radar to Apple: FB7514196You can see a copy here: FB7514196
oldnotwise
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...addendum: the issue happens only for requests that have a fetchBatchSize set.
Bug submitted as: FB8562978 - http://www.openradar.me/FB8562978
Happy to see Apple engineers are already aware of this.
Thank you, I confirm the same workaround works, it looks like it is the same issue.
I resolved the issue removing all devices from Window->Devices and Simulators->Devices and re-adding them.