Hoppers will not pick up items that are inside of them. Watch the gif to see this bug in action. And no, the hopper is not powered, that is not why the shulker box is just sitting there.
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Sorry for the delay, kinda let this one slip thru the cracks.
Here's a world download with the same unloader i used to discover this bug. Just follow the instructions on the signs, in game, to start. After about 6 or so rounds you'll notice the the hopper doesn't pick up all the boxes.
Also, don't mind the world. This happens on all worlds :3
http://www.mediafire.com/file/jc8jbctts58975j/i_hope_you_dont_have_a_potato_-_Copy.mcworld
For science i'll include some more shots of it broken.
Confirmed, I spent too long looking at this, I have the feeling it has something to do with pulling from an inventory then the hopper getting locked.
Oh hai gruva o/
I'v also had this happen with hoppers that do not get powered at all.
fill a double chest with none stackables, put a hopper going into the side of it, then break the double chest. a lot of items will land on/in the hopper. so that even when you empty the hopper inventory, it will still have items on top of it :/
This may be working as intended, and behaves the same way as the Java edition: Hoppers won't collect dropped items if the block above them is a container†.
For your design, perhaps you need to delay the time between the next container being placed above the hopper, and possibly delay the redstone torch underneath the hopper, so there is a time where the hopper does not have a container above it, and also where the hopper is not being powered (locked).
From your comments though I'm not sure if there are other scenarios where hoppers aren't collecting items when they should be, perhaps you can add more information to help reproduce those?
(Tested before reported - from 'Technical Bugs List' https://docs.google.com/document/d/1nziKYzCr4pBdCRj2gIMlfr9MVdWHd6HyafdiBHx9F0c/edit)
This issue happens in 1.14.30 hotfix and 1.15.0.51 also.
I cannot reproduce this bug in 1.14.30
using the steps and/or test world described in Pho's comment: see
,
nor as described in Insane96MCP's comment and the video attached to the duplicate report, MCPE-35132: see
,
nor with the method suggested by SilentWhisperer in his comments responding to Gruva and Mega_Spud: see
In each case hoppers collect the items as expected.
Since the original .gif and test world linked by SilentWhisperer are no longer available, I see no reason to think the 1.13 changelog was wrong in stating,
Hoppers now pick up items from above correctly (MCPE-31393)
If anyone can show that this bug still occurs, please provide a clear demonstration or reproduction steps that differ from those mentioned above.
Note: the issue described in MCPE-46587 still occurs, but it seems to be specific to the piston mechanics and the hopper hitbox. It is not the issue that was described in this report and fixed in 1.13.
There is another bug with hopper collection being tracked MCPE-38963 that is still reproducible in 1.14.30.
I'd like to confirm this issue, but the gif leaves me with some questions about how to duplicate the build. Could you please upload a world that reproduces the issue?