Breaking a shulker box that contains an item in creative mode causes the shulker box to drop a copy of itself

Breaking a shulker box that contains an item in creative mode causes it to drop a copy of itself
I have linked a video of this bug in effect below due to the file size being to big to attach to this post

https://www.youtube.com/watch?v=0nZylkKByyE&feature=youtu.be