Common sense Info
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• I play...
  • With a large modpack
  • Only with CQR and it's dependencies
• The issue occurs in...
  • Singleplayer
  • Multiplayer
• I have searched for this or a similar issue before reporting and it was either (1) not previously reported, or (2) previously fixed and I'm having the same problem.
• I am using the latest version of the mod (all versions can be found on github under releases)
• I read through the FAQ and i could not find something helpful (FAQ)
• I reproduced the bug without any other mod's except forge, cqr and it's dependencies
• The game crashes because of this bug

Versions
Chocolate Quest Repoured ('latest' IS NOT a valid version! Please use the version string that shows up in the mod overview of forge): 2.5.3B
Forge: 14.23.5.2855
Minecraft: 1.12.2

Describe the bug
It's a dupe bug with stacked heads and crown. I think it's caused with the crown attachment feature not knowing how to act when the item they're being used on is stacked.

To Reproduce
Steps to reproduce the behavior:

NOTE: I'm going to use 31 wither skulls in here as an example. But please note that any type of head with any type of number works.

1. Open a crafting GUI. 2x2 or 3x3. Any type.
2. Place 31 wither skulls with a crown.
3. The output should be 31 wither skulls with crown. And when you take the crowned skulls out the crafting grid only wastes 1 skull.
4. When you try to take the crown out of the 31 skulls, you get 31 more normal skulls automatically per 1 crown take out.

Expected behavior
Basically both the skulls and crowns getting duped because of it.

Screenshots
https://cdn.discordapp.com/attachments/825840715631165501/842868237015318528/unknown.png
https://cdn.discordapp.com/attachments/825840715631165501/842868257358348310/unknown.png
https://cdn.discordapp.com/attachments/825840715631165501/842869717634646016/unknown.png
https://cdn.discordapp.com/attachments/825840715631165501/842871242087858226/unknown.png

Other

• Link to Crash report file: -none-
• Link to Log file: https://pastebin.com/nVihzr4X
• Other mods (that are necessary to produce the bug): -none-
• Other mods (that are also installed): Geckolib - 3.0.0B
• CQR config folder (link, only if you changed the configs): -not changed-
• Other mod's configs (link): -none-

Fixed in 2.6.0B

I don't even know why it is attachable to skulls, that shouldn't be the case

Probably because the player can wear them, just like helmets.

ye, the code only checked if the item can be worn on the head and didn't care about stack sizes