Chests and other containers drop their items when doTileDrops is false, but shulker boxes drop nothing.
MC-107475
Shulker boxes don't drop when gamerule doTileDrops = false
Resolved
Works As Intended
1
Confirmed
Minecraft 16w39a, Minecraft 16w39b, Minecraft 16w39c, Minecraft 16w40a
Retrieved
I reckon this is intended since the items would be contained in the shulker box drop itself, which doesn't drop.