Item duplication by using the hopper

Confirmed in 13w01b.

Only works on the first item thrown in it.

Edit, see [MC-5999] for a better explanation.

Directly you can watch the hopper slots, i tried with other items (netherbrick slab) and it seems that duplicate the item in a save/refresh time, i think.

I tried it and it added one item to the number of items thrown into the Hopper, if you put in on a chest and take the items out of the chest. May work by taking the items from a the hopper or a dispeser/furnace/... too. Works with any item I tested it and in 13w01b. Sry for bad English.
Edit: I'm uploading a video to YT atm, will be up in some minutes: http://youtu.be/8ZLwrSCsef4

for me it works the best, if I incase the hopper and throw the item in the very corner.
if the item is nonstackable, then the hopper duplicates it until the hopper (or a container underneath) is full

Please do not mark unreleased versions as affected. You do not have access to this yet.

I can confirm this. I built a redstone circuit circle with a delay of 2 redstone ticks and let that fire a dispenser. Sometimes when dropping one block into a hopper which leads into a dispenser, the dispenser then outputs two blocks.
Also sometimes it picks a stack from above but that stack does not disappear then.

Got a video that shows everything I wrote above here but currently I can't upload because my connection is sick.

Confirming items not getting removed from the world when lying on a corner/a side of the top of the hopper but getting cloned inside

I filled 2 dispensers with 9 stacks of diamons each and let them pass throug 3 Hoppers. The last chest in the last chest there were almost 40 stacks or diamonds. (belongs to 3 screenshots)

Another video example: https://www.youtube.com/watch?v=tQe5QcfSMl8

Video from me: http://youtu.be/9N1YzxXCdjE

My video: http://youtu.be/zjOMPuuhgCQ

In 13w01b items dupe when item lands onto the edge of the hopper itself.

Here is a crash report!

Confirmed.

Heres my video http://youtu.be/D6qZgWngQp8

TO ALL PEOPLE: You MUST vote for this bug if you want it to be fixed!

Here's how to do it.
Make 2 or more Hoppers leading to a chest. Throw a whole stack of items in (gold or iron is a good example). Watch as you get back nearly 2 whole stacks of the item you put in.

Has to be more than one.

If an item gets on the side of the hopper it will get duped (x2) and if something that cant stack get on the edge/lip of the hopper it will continuously dupe it (boats, buckets of water, minecarts, etc.

Try a tool 🙂 It's hilarious how many you get back
Threw in pickaxe, got back 12 of the same one.

Hey Dinnerbone, any chance for a 13w01c? I know of at least 2 bugs that are now fixed that would REALLY help me out!

start with 65 items. throw one item on to the hopper edge by bouncing off a wall. throw the stack of 64 all at once. watch as you get 19 stacks of said item as long as you are standing back.

I had this problem but it kept up until item was removed or no more space. I had two hoppers next to each other and had them empty into one large chest. The one item filled the chest and hopper then I picked it up and emptied the chests for lots of any item I tossed onto it.

Don't create a supercircuit, only test it with a hopper, only a hopper and watch his slots. by this way, they will begin to check the hopper data and not cases like hopper-chest or hopper-hopper.

PD: YEEEE resolved 😛, not cheats jijijiji

It happens when an item is thrown on the side of hopper.

As well, I have found that sometimes, when an item is in the hopper, and the hopper is over a trapped chest (unconfirmed with a regular chest), the item can sit in the hopper while the chest is filled with the item. I.e. I have one piece of glowstone dust sitting in the hopper, and it is not being transferred to the trapped chest, but when I look in the trapped chest, it is slowly filling with glowstone dust as if the hopper were constantly feeding it.

95 duplicates.

New record.

Works with any item, it usually happens when throwing the item on the edge of the hopper. No chest is needed.

Modified the description to include the exact replication steps

100 duplicates! Let's throw a party 😃

So hard to find this report in the search function.
With all the duplicates!

Also happens in 13w01b.

This is no longer a problem with the more recent snapshots. If you do, however, find the bug to be occurring again, please say so. Otherwise, it has been fixed.

I'm still able to reproduce it in the same way I described earlier under the latest snapshot. Though the result of the bug is the same, as I'm doing other things to produce it I suppose it may be a separate issue from the bug originally reported here.

So you were using 13w17a?

@Jason

I've been able to replicate this in 1.5.1, but I haven't tried the recent snapshots yet. This issue may require a new bug report, since it seems to be an issue unrelated to the current MC-5998.

@Jason: I was able to reproduce, so please create a new private ticket for this bug.

@Justin Lawen @Tails : Thanks, the ticket is MC-15019.

My report has just been declared "duplicated". It's NOT : This issue is declared "Fixed" and it's NOT. The same bug can be reproduced with All 1.8 snapshots. Thanks for really Reading the content of the reports, when the title clearly indicates an Error from the bug tracking. Good evening.

EDIT : Thanks for your answer Tails, I can't wait for this bug to be finally definitely fixed... Will this one be fixed for 1.8 ?

Nicolas Posocco, your bug is described in a private ticket, see comments above.

Closing, since this particular report was fixed ages ago.