[MC-231747] CustomModelData is removed when moving an item with Attribute modifiers.

Moving an item in your inventory results in the item losing its CustomModelData nbt tag if it has the AttributeModifiers nbt tag.

Tested using the following:

give @p minecraft:iron_axe{CustomModelData:1b,AttributeModifiers:[{AttributeName:"generic.attack_damage",Slot:"mainhand",Amount:8,Operation:0,UUID:[I;1,0,0,1]},{AttributeName:"generic.attack_speed",Slot:"mainhand",Amount:-3.1,Operation:0,UUID:[I;2,0,0,2]}]} 1

give @p minecraft:iron_axe{CustomModelData:1b,AttributeModifiers:[{AttributeName:"generic.attack_damage",Slot:"mainhand",Amount:8,Operation:0,UUID:[I;1,0,0,1]},{AttributeName:"generic.attack_speed",Slot:"mainhand",Amount:-3.1,Operation:0,UUID:[I;2,0,0,2]}]} 1

Using the next command it shows the data getting removed after you move it in your inventory.

data get entity @s Inventory[0].tag.CustomModelData

data get entity @s Inventory[0].tag.CustomModelData

Comments 2

Daniel 2021-07-11T19:57:02Z

After posting I realised the server I was on was on a modified version. After testing in single player it does not occur.

May still happen on unmodified servers but I am unable to test that.

tryashtar 2021-07-11T22:35:37Z

FYI CustomModelData is an int, not a byte, so correcting that may fix it for you