As the title says, the kit will spawn the custom item but will use the default item name instead of the configured "custom item name." For example:
{
"Shortname": "battery.small",
"DisplayName": "ELECTRICAL POWER",
"Skin": 3063822966,
"Amount": 10,
"Condition": 0.0,
"MaxCondition": 0.0,
"Ammo": 0,
"Ammotype": null,
"Position": 20,
"Frequency": -1,
"BlueprintShortname": null,
"Text": null,
"Contents": null
},
It will spawn the custom skin with the name "battery small" instead of the configured name "ELECTRICAL POWER." This also happens with the ALPHALOOT.