Here is the error's description:
"Unable to invalidate interval: no data source available."
No sure what it means?
stef2nice
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Oops, finally I found the property isEditing on collectionView...
I have the same issue. I modified the SimpleListViewController in the Apple sample Implementing Modern Collection Views. I changed it with 1000 items in the model. The Prefetch Data Source it is only called once....
I have exactly the same issue....