loot table mana_stone.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "name": "pool1",
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
                    "functions": [
            {
              "function": "minecraft:copy_name",
              "source": "block_entity"
            },
            {
              "function": "minecraft:copy_nbt",
              "source": "block_entity",
              "ops": [
                {
                  "source": "inv",
                  "target": "BlockEntityTag.inv",
                  "op": "replace"
                },
                {
                  "source": "essence1",
                  "target": "BlockEntityTag.essence1",
                  "op": "replace"
                },
                {
                  "source": "essence2",
                  "target": "BlockEntityTag.essence2",
                  "op": "replace"
                },
                {
                  "source": "essence3",
                  "target": "BlockEntityTag.essence3",
                  "op": "replace"
                },
                {
                  "source": "essence4",
                  "target": "BlockEntityTag.essence4",
                  "op": "replace"
                }
              ]
            },
            {
              "function": "minecraft:set_contents",
              "entries": [
                {
                  "type": "minecraft:dynamic",
                  "name": "minecraft:contents"
                }
              ]
            }
          ],
          "name": "asuramagica:mana_stone"

        }
      ],
      "conditions": [
        {
          "condition": "minecraft:survives_explosion"
        }
      ]
    }
  ]
}