When deleting photos, encountered PHPhotosError.operationInterrupted (3301).

Hi, I’ve developed a photo app that includes a photo deletion feature.
Some users have reported encountering PHPhotosError.operationInterrupted (3301) when attempting to delete photos.

Initially, I suspected that some of the assets might have a sourceType of typeiTunesSynced, since the documentation notes that iTunes-synced assets cannot be edited or deleted.
However, after checking the logs, all of the assets involved are of typeUserLibrary.
Additionally, the user mentioned that some photos in the iPhone Photos do not show a delete button. I’m unsure whether the absence of the delete button is related to the 3301 error.

I’d like to confirm the following:

1. Under what conditions does PHPhotosError.operationInterrupted (3301) occur, and how should it be handled?
2. Why do some photos in the iPhone Photos not show a delete button?

The code for deleting photos is as follows:

PHPhotoLibrary *library = [PHPhotoLibrary sharedPhotoLibrary];
[library performChanges:^{
    PHFetchResult *assetsToBeDeleted = [PHAsset fetchAssetsWithLocalIdentifiers:delUrls options:nil];
    if (assetsToBeDeleted) {
        [PHAssetChangeRequest deleteAssets:assetsToBeDeleted];
    }
} completionHandler:^(BOOL success, NSError *error) {