Forge 1.16.4-35.1.28 recipe not working

I’m quite new to modding with forge, so this question may be dumb or silly.

First there’s my file: (located at ~/forge-1.16.4-35.1.28-mdk/data/chemc/recipes/H2_O2__H2O.json)

{
    "type": "minecraft:crafting_shapeless",
    "ingredients":
    [
        {
            "item": "chemc:hydrogen"
        },
        {
            "item": "chemc:oxygen"
        }
    ],
    "result":
    {
        "item": "minecraft:water_bucket"
    }
}

The problem is, when I load the game and switch to survival more trying to combine hydrogen and oxygen to make a water bucket, but it seems that it can’t be crafted.

Suppose the items are registered correctly, as I can get them in-game.
Main Mod file so you can see the unlocalized named of the items.

package com.***.***.mcmods.chemc;

import com.***.***.mcmods.chemc.items.Hydrogen;
import com.***.***.mcmods.chemc.items.Oxygen;

import net.minecraft.block.Block;
import net.minecraft.item.Item;
import net.minecraft.item.Item.Properties;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;

// The value here should match an entry in the META-INF/mods.toml file
@Mod(CheMC.modid)
public class CheMC {

    public static final String modid = "chemc";
    static Item i_h = new Hydrogen(new Properties()).setRegistryName("chemc", "hydrogen");
    static Item i_o = new Oxygen(new Properties()).setRegistryName("chemc", "oxygen");

    public CheMC() {
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
        MinecraftForge.EVENT_BUS.register(this);
    }

    private void setup(final FMLCommonSetupEvent event) {
    }

    // You can use EventBusSubscriber to automatically subscribe events on the
    // contained class (this is subscribing to the MOD
    // Event bus for receiving Registry Events)
    @Mod.EventBusSubscriber(bus = Mod.EventBusSubscriber.Bus.MOD)
    public static class RegistryEvents {
        @SubscribeEvent
        public static void onBlocksRegistry(final RegistryEvent.Register<Block> blockRegistryEvent) {
            // register a new block here
            // blockRegistryEvent.getRegistry().registerAll();
        }

        @SubscribeEvent
        public static void onItemsRegistry(final RegistryEvent.Register<Item> itemRegistryEvent) {
            // register a new item here
            itemRegistryEvent.getRegistry().registerAll(i_h,i_o);
        }
    }
}

The documentation I took a look at: ReadTheDocs Forge 1.16

Output of ./gradlew runClient –full-stacktrace –debug –info –parallel

Any answer would be appreciated!

// The value here should match an entry in the META-INF/mods.toml file
@Mod(CheMC.MODID)
public class CheMC {

    public static final String MODID = "chemc";

    public CheMC() {
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
        MinecraftForge.EVENT_BUS.register(this);
        ModItems.init();
    }

    private void setup(final FMLCommonSetupEvent event) {
    }
}

public class ModItems {
    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, CheMC.MODID);

    public static final ItemGroup ITEM_GROUP = new ItemGroup(CheMC.MODID) {
        @Override
        public ItemStack createIcon() {
            // pick any item here, it will be the icon for your creative tab
            return new ItemStack(HYDROGEN.get());
        }
    };

    public static void init() {
        ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
    }

    public static final RegistryObject<Hydrogen> HYDROGEN = ITEMS.register("hydrogen", () -> new Hydrogen(new Properties().group(ITEM_GROUP)));
    public static final RegistryObject<Oxygen> OXYGEN = ITEMS.register("oxygen", () -> new Oxygen(new Properties().group(ITEM_GROUP)));
}