Minecraft 17w45b, Minecraft 17w46a, Minecraft 17w47a, Minecraft 17w47b, Minecraft 17w48a, Minecraft 17w49b, Minecraft 17w50a, Minecraft 18w01a, Minecraft 18w02a, Minecraft 18w03b, Minecraft 18w05a, Minecraft 18w07a, Minecraft 18w10d, Minecraft 18w11a, Minecraft 18w16a
When using /setblock x y z air destroy on a container (chest, dropper, etc) with items inside, the container is broken and dropped but the contents disappear completely.
I distinctly recall the contents dropping in 17w43b, and I'm pretty sure it worked in 1.12 as well.
Put down a chest, shove some stuff in there, and target it with a /setblock destroy command. The chest drops, but the stuff inside is gone.
As of 17w46a, it now works fine with /fill, but not with /setblock.