Hopper problem

Hi. Well, I was doing some things with hoppers, a coal flow pipe in this case. Well, the hopper is supposed to look to one side and the items will go where the hopper indicates, but when there is another hopper underneath, the items on top fall to the bottom, ignoring that the top hopper is not connected to the one below.
I think this should be fixed, I have no idea if it had been reported, and I think it has been like this since the hopper appeared.
I hope it stops happening in the next versions :T