From the new feature in 1.10, how Items can now be pulled in by fishing rods.
When you latch onto a item, and then pull back the fishing rod, then you will sometimes be able to fish the item in, but you will not always get the item to move. Sometimes it will just stay still.
In the YouTube video bellow, I show myself pulling the 3 items in at different distances, and how it is just completely random how the item gets pulled to you. You can even pull items up distances, but they will still be suborn, as you can see the last item I could not even rod it.
In the new video, it even shows that fishing rods themselves do not properly attach to mobs/items. In the video I try to latch on the items, show what it looks like when you attach them to mobs too, and also sometimes I showed what it looks like when it hits the ground, so you can tell that it is actually attaching to the item.
I can across this while trying to make a new mini-game using this feature as its main function to collect items and score points in the game.