PHAsset with sourceType .typeCloudShared contains no resources

I am using PhotoKit to access Photos in iCloud. For photos who's source is .typeCloudShared, there is no PHAssetResource associated with a PHAsset retrieved from PHFetchResults. This is only true for images/live photos, for videos there are resources available. Snippet below.

func doPhotos(photos: PHFetchResult) -> Void {
    photos.enumerateObjects({ (asset, idx, _) in
        let resources = PHAssetResource.assetResources(for: asset)
        for resource in resources {
            // This is never called when asset.sourceType == .typeCloudShared
            // and asset.mediaType == .image
        }
    })
}

func fectchAssets() -> Void {
    var fetchOptions: PHFetchOptions!
    fetchOptions.includeAssetSourceTypes = [.typeUserLibrary, .typeCloudShared, .typeiTunesSynced ]
   
    let sharedCollection = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .albumCloudShared, options: nil)
    sharedCollection.enumerateObjects( {(collection, idx, stop) in

        let sharedPhotos: PHFetchResult = PHAsset.fetchAssets(in: collection, options: fetchOptions)
        doPhotos(photos: sharedPhotos)
    })
}

For other source types, I am able to receive resources. I am able to retreive image data via PHImageManager like below:

func doPhotos(photos: PHFetchResult) -> Void {

    photos.enumerateObjects({ (asset, idx, _) in

          let ops = PHImageRequestOptions()

          ops.isNetworkAccessAllowed = true

          ops.isSynchronous = true


          PHImageManager.default().requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .default, options: ops, resultHandler: {(image, info) -> Void in

          // This works, image info is valud 

          })

I am wondering if this behavior is intended. Thedocumentation notes:

"Assets from shared albums cannot be edited and do not appear in Moments collections."

I would prefer to work with PHAssetResource as this contains more information and allows for retrieval of original image data (including file format, etc.)

Any insight woudl be appreciated.