Ok, so I had this figured out.
This API diff was more useful than the release notes in identifying the change
codeworkshop.net/objc-diff/sdkdiffs/ios/14.0b2/UIKit.html
The property has been moved from UICollectionViewListCell to UICollectionLayoutListConfiguration
public var trailingSwipeActionsConfigurationProvider: UICollectionLayoutListConfiguration.SwipeActionsConfigurationProvider?
public typealias SwipeActionsConfigurationProvider = (IndexPath) -> UISwipeActionsConfiguration?
What's strange is that you now have to depend on IndexPath which I thought was on the way out... Oh well...
All working, but code that was shown in the videos and early blogs are broken now...
bobasdflkjlkdsfj
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Same issue in my project. Still there in beta 4