Open Radar

 
Summary:
There are 2 scenarios (in all cases canPerformEditOperation(.Delete) indicates the asset[s] ARE deletable):
1.) Perform deleteAssets change request on asset that is NOT the representative photo from a burst sequence -> nothing is deleted
2.) Perform deleteAssets change request on asset that is the representative photo from a burst sequence -> entire burst is deleted

Steps to Reproduce:
1.) Call PHAssets.fetchAssetsWithOptions with includeAllBurstAssets enabled
2.) Call PHPhotoLibrary.sharedPhotoLibrary().performChanges({PHAssetChangeRequest.deleteAssets(...) ... on asset(s) in a burst such that none of the assets are the representative photo.
3.) Call PHPhotoLibrary.sharedPhotoLibrary().performChanges({PHAssetChangeRequest.deleteAssets(...) ... on the representative photo (representsBurst == true) of a burst. 

Expected Results:
When non-representative photo is deleted, it should be removed from the burst.
When representative photo is deleted, it and it alone should be removed from the burst. 

Actual Results:
When non-representative photo is deleted, no photos are removed from the burst.
When representative photo is deleted, the entire burst is deleted. 

Version:
iOS 8.1.3 (12B466)

Notes:
Things get more complicated when you use the "Select..." feature in Photos.app on a burst sequence so that they show up as individual photos in Photos.app. Then you CAN delete them from the photo grid but they are still not removed from the burst.