Sand and Gravel will be destroyed when dropped on torches

This BUG actually happens in both Survival and Creative mode, but since creative has unlimited resources, it is not that bad, but it really is a pain in the ass when you are trying to harvest some flint from the gravel and all of them simply disappears(without even dropping the original block! I hope this can be fixed in the next update. Thank you Mojang. Minecraft is a great game, no matter the PC,PE or XBOX, they are great and keep up the Great work!