Its not a suggestion when it existed before. Its a bug, plain and simple. This is a bug tracker.
The bug: Items moving in water shouldn't get caught in the collision box of the hopper.
Done.
*An important fix*? You fixed two visual glitches and two minor annoyances, and broke half of beginner red-stone. Go update every item transport guide with your double enderchest solution.
Try explaining to every newbie to this game that they need ender chests before they can move items with water.
Keep the visually glitches, mechanics matter more.
WORKS AS INTENDED?!
Nope. That should never be how water streams work. How can we build item filters without massive amounts of hoppers and tile entities?
How can we add any complexity at all with item transport? First the glass elevator and now this? Seriously?
This should not be intended macro-behaviour. Maybe you fixed a collision bug, wonderful - don't care. Don't break redstone that's worked since hoppers were introduced.
Not worth the time, sorry. I fixed my bug, let someone else deal with it.
The majority of the advice on the internet for how to reset the ender dragon fight it "Remove the DIM1 folder".
This will not go away with 1.9 - as many many years of removing that folder has made the SEO favor it.
Therefore, I believe there should be some way via gamerule or otherwise to reset the fight, because I may have been the first, but I will not the be the last to have this happen.
Idiots. You're all idiots.
You've lost your head in technical details and marred user experience because you've all forgotten what its like to be new to this game.