Items shot by droppers and dispensers can't be picked up as soon as they should

If you put an item in a dropper and drop it, it will act as if it was dropped by a player, which means there will be a delay between the moment the item is shot and the moment it becomes possible to get it.

Steps to reproduce :
-Place an item in a dropper
-Power the dropper
-Pick up the item.

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Addition by [Mojang] Mega_Spud (Jay Wells): Added comparison video: https://youtu.be/xyYD5DjwcPI