How to reproduce
Place an item frame with an item in it
Run the following command
/data merge entity @e[type=item_frame,sort=nearest,limit=1] {Item: {components:{"custom_name": '{"text":"Hello"}'}}}✔ Notice that the item was given the custom name as expected
Run the following command to change the custom name
/data merge entity @e[type=item_frame,sort=nearest,limit=1] {Item: {components:{"custom_name": '{"text":"World!"}'}}}❌ The item wasn't renamed, the command silently failed, and an error was logged to the console
[00:45:25] [Server thread/ERROR]: Tried to load invalid item: 'Duplicate entry for key: 'b[type=minecraft:custom_name, removed=false]' missed input: {custom_name:'{"text":"World!"}'}'Now run the following command to rename the item, including the
minecraft:prefix/data merge entity @e[type=item_frame,sort=nearest,limit=1] {Item: {components:{"minecraft:custom_name": '{"text":"World!"}'}}}✔ Notice that this worked
Linked issues
Comments 5
Found another case: On an armor stand holding a shield,
/data get entity 0bb8a90b-3333-4fcf-be1b-31f61f9bd3d3 HandItems[1].components.banner_patterns[0].colordoes nothing, but
/data modify entity 0bb8a90b-3333-4fcf-be1b-31f61f9bd3d3 HandItems[1].components.minecraft:banner_patterns[0].color set value blueworks
Cannot reproduce on a new item. When I drop an item and run following command, the item gets named as expected
/data merge entity @e[type=item,sort=nearest,limit=1] {Item: {components:{"custom_name": '{text:"fool"}'}}}However running that same command on an already named item on the ground leads to your observed results.
This might be related to MC-268833
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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I'm not sure if this is related to MC-269271
which I submitted earlier. It seems reversed, in that here the nbt path does not require the prefix, where there it does. I put this in just to potentially add useful info, but I'd personally guess they have different fixes.