When scaling a map with a crafting table, shift-clicking won't apply the correct scaling level. Picking it up without shift-clicking scales it at the correct level.
What I expected to happen was...:
To have my map scaled at the next level (in this case, level 0 to level 1).
What actually happened was...:
It stayed on the same scale level (in this case, 0).
Steps to Reproduce:
1.Get a map (not empty), a crafting table and some paper.
2.Craft it with a map in the middle and paper around, like you would when you want to scale a map.
3.Pick up the map with the help of shift, it won't apply the correct level.
EDIT: A video was created by Mike B to showcase the bug in 13w03a, thanks. http://youtu.be/eP9SSYwDOKc
BUT, shouldn't we update the video? I'm asking for someone to recreate the same bug in Minecraft 1.10.2, just to show that it is still in the game.
EDIT 2: Just tested in 1.6.2, now when shift-clicking, it says on the tooltip "(Level 1/4)" but it's still on the scale level 0. If try to scale it again, it just stays on "(Level 1/4)" and doesn't scale.
EDIT 3: 3 years and months after I posted this bug, it's still isn't fixed. Wow! I'm getting older, so is the bug. Can't we get it fixed already? Seriously, it's been there since Minecraft 1.4.1 and when the bug tracker was launched. Shows sometimes how ineffective this bug tracker is. As of right now, 56 duplicates have been posted, which is a lot. This needs to be forwarded to the Mojang team ASAP, so it can be fixed. We are now in 1.9.1 pre-release 3, just tested it, and it's still bugged. Probably will be or is one of the oldest bugs posted here that hasn't been fixed.
EDIT 4: Fixed the english because I'm a retard.
Too much EDITs : Looking through the comments again and I just saw that a comment, posted by Tobias Kamphuis a long time ago, linked a video of someone doing a let's play. While playing, he experienced this bug. It's a old version of Minecraft, but it's still relevant : https://youtu.be/Dp-Ecc86ICU?t=5m51s . Lost 8 paper in the the process. Imagine what would of happened if he scaled maps in a rapid succession...
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I have a feeling this may be related to a bug that's been around for a while. In previous versions, shift-clicking when making a map would result in the a duplicate of map_0.

Can confirm that the bug exists. The tool tip in the workbench window doesn't get updated to reflect the new scale level, and you wind up with the old scale level when you shift-click. Only by clicking and dragging to your inventory and releasing does the map get updated with the new scale.

Yes, I know you can just drag it in your inventory but if you shift-click by mistake, you will lose 8 papers.

I've tried this too, it happens every 2 out of 3 times you shift click it.

See MC-795 for a detailed description.

Is this still a concern on Minecraft 1.4.4 Pre-Release? If so, please update the affected versions.

Hmmm, still an issue for sure, and very inconsistent. Logging out and back in again to cause the data to be written out and read back in gave me a map that insisted it was still scale level 0/4, but when shift-clicked out of the crafting window after attempting to scale out again, gave me something that said 2/4, which wouldn't render the world, and is in fact still scale level 0/4 anyway.

Found this bug too (version 1.4.7).
Tried to scale Map #1 out. Expected to receive Map #2 (scaled out version of Map #1). Instead I received Map #1 (all eight paper were still used in the process). Confused, I tried a few more times. Finally, by regularly dragging the map into my inventory, I received Map #6.
I will post a video if requested.

This bug still occurs in the most recent snapshot (13w03a).
Operating System: Windows 7
Minecraft Version: 13w03a
Java Version: 7u11
Video Proof: http://youtu.be/eP9SSYwDOKc
Clicking and dragging scaled map produces a different result than shift-clicking a scaled map.
There also is a delay to update on the scaled map tag information at the crafting output stage. It appears to happen at some point between dragging the new scaled map into my inventory from the crafting table output.

Long time that this is up and it is still not fixed. Oh well.
Thanks for the video Mike B, i'll put that in the description.

Still exists in 13w09a. Pretty annoying. I tend to shift-click by default since normally it doesn't hurt.

Can we get a confirmation of whether this happens in 13w10a and an update to the affected versions?

Yep, I can confirm this in 13w10a.

I can confirm this in 1.5.1
http://www.youtube.com/watch?v=Dp-Ecc86ICU
Video by IamSp00n

Nobel Harvards, it IS a bug because you dont even get a copy if you do this, you only get the same map back and lose 8 paper.

This is true. To clone a map, simply place your map with an empty one in the crafting table (see Minecraft wiki for details).

Cube, i was aware of it but he said this wasn't a bug.
I just told he was thinking of a differend crafting recipe by proving him wrong.

Tobias: I think Cube is agreeing with you, not Nobel.

Indeed I am agreeing with Tobias.

Okay, so I have updated the Affects Versions with the recent snapshot 13w25c and I hope this will be fixed for 1.6. This bug still occurs on the snapshot 13w25c.

haven't had this problem until the last two snapshots for 1.6+1.6pre release, now its rather annoying, hope it gets fixed soon

I can still confirm this for 1.6.2 (ever since 1.5.7), have lost a whole stack of paper and filling up our server with useless map numbers. Can it get fixed at some point, or at least prevent shift-clicking?

It still exists in 13w38c. This is going nowhere, fast.

This still occurs in 13w39b.

I've had this happen in 1.6.4. Annoying.

Still present in 1.7 pre-release.

Still in 1.7.4

Still in 14w03b.

Still in 14w04b, really annoying.

Still in 14w05a

Still in 14w07a

Still in 14w08a

Still in 14w10a/b
Also in 14w10c

Still in 1.4.7. Seems to happen randomly had several maps update ok but then it decides not to. Server 1.7.2.
Maps do not update when shift clicked, but can still be dragged to inventory to update.

Still in 14w18b

its is not resolved the issue still occurs

I had it in a snapshot

What exactly is a snapshot ?

Still present as of 14w28b

Still in 14w29b

Still in 14w30c

Still in 14w31a

Confirmed in 14w33a

Confirmed on 1.8pre-1

Confirmed on 1.8-pre2

Confirmed 1.8

Still in 1.8.1

Still in 1.8.2-pre1

Still in 1.8.3

Still exists in 1.8.4

Still in 1.8.6

Still in 1.8.7

Confirmed for Snapshot 15w31a

Still in 15w31b and 15w31c aswell

Confirmed for zooming in a map with shears in 34a.

This recently started happening to me in my SMP world when I got to just over 200 maps (202). Now when I surround a map with paper, the output map ID is the same as the input map ID. Interestingly though, it does create a map_2xx.dat file. I can also continue to create new maps, I just cannot resize them.
This is in stock 1.8.8.

No longer applies to shears in 15w45a as the crafting recipe was removed.

Confirmed for snapshot 15w47a

Confirmed for 15w47b

Confirmed for 15w49a

Confirmed for 1.8.9 and 15w51b.

Confirmed for 16w02a.

Confirmed for 16w03a.

I can confirm this on 1.8.9. Have wasted so much paper that I spent precious time farming just because I accidentally shift clicked while zooming out a map instead of simply clicking. Punishing the user for a simple mis-click.

Confirmed for 1.9-pre1

Actually reporting that some bugs marked as duplicates of this (but are not really the same) still exist in 1.9-pre4
When zooming a filled-in map with paper (clicking, not shift-clicking) the map will change scale but you end up with a blank map.
Discovered in single-player, survival mode.
Re-loading the world does not fix the map.

This is the process of this bug, instead of the text that "Steve" wrote you can follow the steps to reproduce this in the images chronologically.

Confirmed for 1.9.3 pre-2.

Confirmed for 1.9.3-pre3.

Confirmed for 1.9.4.

Confirmed for 16w20a.

Confirmed for 16w21a.

Confirmed for 16w21b.

Confirmed for 1.10-pre1.

Confirmed for 1.10-pre2.

Confirmed for 1.10.

Confirmed for 1.10.1.

Confirmed for 1.10.2

@@unknown: There is no need to leave a comment "Confirmed in xx.xx" if that version is already in the affected versions (see top of ticket)

Oops, sorry didn't see it there

Now some other weird thing happens. See attachment "Bildschirmaufnahme 06".

No, I didn't press any number keys, I just closed the inventory. There was also no duplication, the item jumped from one slot into another.

This issue still occurs in 1.10.2
@unknown, this is fixed in 1.11.