NSFileProviderReplicatedExtension stopped calling fetchContents

Hello all,

When copying a lot of files using NSFileProviderReplicatedExtension (more than 2000 files) to the a local storage, fetchContents is called for each file, but usually after around 2000 files, fetchContents is not called anymore. No errors, no invalidate() called, no cancelations, no log messages, just silence.

Is there any explanation or solution for this behaviour? I want the extension to provide all files until the end.

By the way, if the transfer fails, but you double click on the local folder a "Finish Copying" option is presented and after that fetchContents for the remaining files is called (which is good).

Thank you.