How to detect item on the ground with components?

[valid agate]

I cant detect item on the ground with component.
Command:
execute as @e[type=minecraft:item,nbt={custom_data:"cubic"}] if items entity @e[type=item] container.* player_head[minecraft:custom_data={cubic:1b}] run give @p diamond

[deft lagoon]

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[calm fractal]

execute as @e[type=minecraft:item,components={"minecraft:custom_data":"cubic"}] if items entity @s container.* player_head[minecraft:custom_data={cubic:1b}] run give @p diamond should work

[faint nymph]

This command is not correct.
First of all, components are never a single string, they are part of a compound execute as @e[type=minecraft:item,nbt={custom_data:{cubic:1b}}]

[calm fractal]

no wait actually you are using two different values for the "cubic" custom data

[faint nymph]

next, a small improvement would be to change container.* to container.0 as this is the only slot an items has.

[rapid kettle]

Here a better performant version of the command

execute as @e[type=minecraft:item] if items entity @s container.0 player_head[minecraft:custom_data~{cubic:1b}] at @s run give @p diamond

[faint nymph]

I removed the nbt check as it will greatly increase lag if you have many items in your world.

If possible always avoid nbt checks (especially entity nbt checks)

Another thing is the ~ in the if items part. If you use = it will fail if there is any other data than the one tag you're testing for. ~ on the other hand only checks if the specified tag is present and has the correct value regardless of the other data in custom_data tag.

[valid agate]

Thank you for the help!
This command works perfect!