I created my custom Block and I simply want it drops itself, so I just created the Loot Table but it doesn't work.

Here's the Registry code:

public class RegistryHandler {
    // create DeferredRegister object
    public static final DeferredRegister<Block> BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS, MossyDeepslate.MOD_ID);
    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, MossyDeepslate.MOD_ID);

    public static final RegistryObject<Block> MOSSY_DEEPSLATE = BLOCKS.register("mossy_deepslate", () ->
            new Block(BlockBehaviour.Properties.of(Material.STONE, MaterialColor.DEEPSLATE).requiresCorrectToolForDrops().strength(0.3F, 0.3f).sound(SoundType.DEEPSLATE)));

    public static final RegistryObject<Item> MOSSY_DEEPSLATE_ITEM = ITEMS.register("mossy_deepslate", () ->
            new BlockItem(MOSSY_DEEPSLATE.get(), new Item.Properties().tab(CreativeModeTab.TAB_BUILDING_BLOCKS))
    );
  
  public static void init() {
        // attach DeferredRegister to the event bus
        BLOCKS.register(FMLJavaModLoadingContext.get().getModEventBus());
        ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
    }
}

The loot table json file:

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "mossy_deepslate:mossy_deepslate"
        }
      ]
    }
  ]
}

The folder:

I think all should work, but...

Please Help me I can't release my mod if my block doesn't drop itself...

Are there any errors in the log?

[Render thread/ERROR]: There are unidentified mappings in this world - we are going to attempt to process anyway

Perhaps it has something to do with the modid being the same as the block's name?

Loot table looks ok to me.