1.21-pre4. Datapack recipes dont add

I need a custom recipes for my world, so I created the simplest datapack:
pack.mcmeta: {"pack":{"pack_format":48,"description":"just a single recipe"}}
recipe data/crafting/recipes/easy_gravel.json:
   "type": "minecraft:crafting_shapeless",
   "ingredients": [
       {
           "item": "minecraft:stone"
       },
       {
           "item": "minecraft:cobblestone"
       },
       {
           "item": "minecraft:sand"
       }
   ],
   "result": {
       "item": "minecraft:gravel",
       "count": 3
   },
   "group": "block"
}```

but for some reason the recipe just dont add, but the datapack is active.
did i made some mistake in meta files or is there any other solution?