Filled shulker boxes don't drop when /gamerule doTileDrops is false (WAI?)

Shulker boxes with items in them do not drop when doTileDrops is false, destroying the items inside. Not sure whether this is intended or not.

Steps to reproduce:
1. Run the command /gamerule doTileDrops false
2. Place a shulker box and put some items in
3. Break it