[MC-341] Duplication and deletion of hotbar items in Creative using number keys

While in your inventory, with items in your hotbar, quickly hitting the numbers while in creative mode can cause some items to overwrite others, and create a duplicate of one item, while removing the other. This does not work in survival.

Spam-clicking items causes same effect. Can sometimes disappear even in survival, see MC-4108.

Easy way to reproduce:

Open the inventory
Put two different items in slots 1 and 2
Hold the mouse over slot 2
Press and hold "1"
The items will swap a while and eventually the item of slot 1 overwrites the item of slot 2

Linked issues

is duplicated by 36

MC-682 When clicked an item in hot bar a lot, it dissapears Resolved

MC-970 Stack Duplication Resolved

MC-1770 Armor Duplication Resolved

MC-2511 Armor Duplication Bug on MC 1.4.2 Resolved

MC-4108 Items disappearing when moved in inventory Resolved

31 more links

relates to 2

MC-4008 Pick block item duplication Resolved

MC-5415 Creative Mode Item Duplication into hotbar Resolved

Comments 39

Vit Musienko 2012-10-25T07:28:43Z

Cannot reproduce 😞

Philip Smith 2012-10-25T14:29:59Z

You have to have your inventory open

Philip Smith 2012-10-26T15:35:46Z

http://www.youtube.com/watch?v=EDJ7fNwK3L0 demonstration of the glitch

kumasasa 2012-12-08T20:52:46Z

Confirmed for 12w49a.
It's not necessary to jam on one of the number keys, it's enough to keep a key pressed for some time.

yut951121 2013-10-20T03:16:17Z

Sorry, can confirm in 13w42b

29 more comments

Mason Brett Irving 2013-10-27T18:21:40Z

Confirmed for 1.7.2

Ezekiel 2014-01-16T00:09:06Z

Is this still a concern in the latest Minecraft version 14w02c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Itouch2 2014-05-07T10:23:57Z

Confirmed for 14w18b.

Jeuv 2014-07-09T20:22:31Z

Confirmed for 14w28a.

Andrew Thomas 2014-07-10T14:51:11Z

Confirmed for 14w28b

Vasil Bochev 2014-08-10T14:30:38Z

Confimred for 12w32a, b, c, and d

Jasper van den Berg 2014-09-13T10:54:01Z

Confirmed for 1.8.

Sonicwave 2014-10-17T03:58:33Z

Confirmed for 1.8.1-pre2. (I switched a minecart with a creeper spawn egg and upon right clicking on the minecart a creeper spawned and the inventory slot immediately changed to the creeper spawn egg.)

Sonicwave 2014-12-26T20:25:37Z

Confirmed for 1.8.1 and 1.8.2-pre1.

Alexander 2015-10-30T20:14:47Z

Confirmed for 15w44b. Here is a slightly different way of reproducing this.

1: Put a stone and a sapling in first and second hotbar slot respectively.
2: While hovering over the second item, hold the 1 for a few seconds.
3: It will seem like nothing has happened. Hower, if you exit to the title screen and reopen the world, the sapling will have turned into stone.

A few points:

It shouldn't take more than 3 tries to reproduce the bug. If it does, put the two items in the opposite order.
It seems like the item with the lowest numerical ID always overwrites the item with the highest ID.
This bug works (seemingly) for any item, if the two items only differ in data value, the one with the highest data value will change to match the one with the lowest data value.

James (inactive) 2015-12-22T23:49:57Z

Confirmed for 1.8.9 and 15w51b.

James (inactive) 2016-01-13T22:43:40Z

Confirmed for 16w02a.

Immaterialise 2016-02-17T17:19:37Z

Confirmed for 1.9-pre1

Commander Sealand 2016-03-01T02:27:57Z

Confirmed for 1.9.0

James (inactive) 2016-03-15T23:07:18Z

May be fixed on 1.9.1-pre3. Happened within 2 seconds in 1.9; could not reproduce within ~60 secs in 1.9.1-pre3.

EDIT: I just reloaded the world in which I did my testing, and the blocks are duplicated!

null 2016-05-05T23:43:05Z

Confirmed for 1.9.3-pre3.

Only appears client-side upon reloading the world.

null 2016-05-11T22:57:49Z

Confirmed for 1.9.4.

null 2016-05-18T21:48:05Z

Confirmed for 16w20a.

null 2016-05-25T22:55:04Z

I can't get this to happen in 16w21a (I did reload the world). More testing is required.

null 2016-05-26T22:49:03Z

Confirmed for 16w21b. This happened without reloading the world.

null 2016-06-03T01:38:52Z

Confirmed for 1.10-pre1. Doesn't seem to happen in the "Survival Inventory" tab.

null 2016-06-07T22:48:20Z

Confirmed for 1.10-pre2.

null 2016-06-08T21:32:43Z

Confirmed for 1.10.

FaRo1 2016-06-09T15:29:09Z

I just reproduced it pretty quickly in 1.10, but then I wasn't able to reproduce it for a long time with different setups mentioned here. Does anyone have tips?

null 2016-06-22T16:57:13Z

Confirmed for 1.10.1.

@unknown: Do not be in the Survival Inventory tab.

null 2016-06-23T16:02:12Z

Confirmed for 1.10.2.

FaRo1 2016-06-24T15:59:03Z

Again: I reproduced it by letting another program type 1.000 "2"s, but then I tried multiple times again and even changed the number to 10.000, but didn't get it. @unknown, how do you reproduce it usually?

null 2016-06-24T17:38:20Z

I put four items with different IDs (not sure if necessary) in slots 1, 2, 3, and 4; then I spam the 1, 2, 3, and 4 buttons while moving my mouse left and right over the slots.

null 2016-06-24T18:27:27Z

@unknown: Here's a video demonstrating the bug. Sometimes it is necessary to reload the world to see the duplication.

Alexander 2016-10-21T09:14:13Z

Unable to reproduce anymore in 16w42a, possibly fixed.

Tried all the aformentioned methods, as well as the method I used to use myself in the past, but it doesn't seem to occur anymore.

Mustek 2016-10-21T09:26:13Z

Resolved as fixed, please update if you can still reproduce this bug by providing proper steps.

Misode 2018-10-29T09:42:44Z

Managed to reproduce this in 18w43c in creative mode. Please reopen.

EDIT: I can reproduce this every time by just holding down a number key.

FaRo1 2018-10-29T09:47:05Z

This has been closed for over a year. Can you please make a video in which you reproduce it?
I'll also try to reproduce it in ~10 hours, I had a pretty reliable way to reproduce it on my old PC, I could transfer it to the new one.

FaRo1 2018-10-29T20:11:53Z

Confirmed in 18w43c, too.