Items that do not stack normally (example : shovel, potions, minecart, ...) are still stacking when we give (<14w32d, VIDEO 1) Now (14w32d, VIDEO 2) when you give these items, they dont stack anymore !
PS: sorry for english i'm Belgian
PS 2: dont use VLC for the videos
This is intended. Duplicate of MC-3444. Note that this behaviour can still be achieved via /replaceitem.