Custom blocks no longer work in MC 1.16 bedrock edition

My custom blocks no longer appear in game since I updated to 1.16

I modified the json files because I heard something had to be changed in there but it didn't fix anything. 

 I modified this : 

{
  "format_version": "1.10.0",
  "minecraft:block": {
    "description": {
      "identifier": "mk:test_block",
      "is_experimental": false,
      "register_to_creative_menu": true
    },
    "components": {
      "minecraft:loot": {
        "table": "loot_tables/blocks/mk_test_block.json"
      },
      "minecraft:destroy_time": {
        "value": 1.0
      },
      "minecraft:explosion_resistance": {
        "value": 1
      },
      "minecraft:friction": {
        "value": 0.9
      },
      "minecraft:flammable": {
        "flame_odds": 0,
        "burn_odds": 0
      },
      "minecraft:map_color": {
        "color": "#FFFFFF"
      },
      "minecraft:block_light_absorption": {
        "value": 0.0
      },
      "minecraft:block_light_emission": {
        "emission": 0.25
      }
    }
  }
}

 to this : 

{
  "format_version": "1.10.0",
  "minecraft:block": {
    "description": {
      "identifier": "mk:test_block",
      "is_experimental": false,
      "register_to_creative_menu": true
    },
    "components": {
      "minecraft:loot": "table": "loot_tables/blocks/mk_test_block.json",
      "minecraft:destroy_time": 1.0,
      "minecraft:explosion_resistance": 1,
      "minecraft:friction": 1,
      "minecraft:map_color": "#FFFFFF",
      "minecraft:block_light_absorption": 0.0,
      "minecraft:block_light_emission": 0.25
      
    }
  }
}