NSFilePresenter gets presentedItemDidChange every second when iOS app runs on Mac

When I run my iOS app on my Mac using "designed for iPad", it seems to get presentedItemDidChange for files it is displaying once every second.

There don't seem to be any changes to the files in the filesystem. Is there any way to debug what is causing the app to receive the presentedItemDidChange callback?

NSFilePresenter gets presentedItemDidChange every second when iOS app runs on Mac
 
 
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