Setting up a location check predicate

So I made a new dimension and want the player to teleport there by sneaking on a certain block that's surrounded by other blocks.
And the following predicate doesn't seem to work:
  "condition": "minecraft:all_of",
  "terms": [
    {
      "condition": "minecraft:entity_properties",
      "entity": "this",
      "predicate": {
        "type": "minecraft:player",
        "flags": {
          "is_sneaking": true
        }
      }
    },
    {
      "condition": "minecraft:location_check",
      "offsetX": 0,
      "offsetY": -1,
      "offsetZ": 0,
      "predicate": {
        "block": {
          "blocks": "minecraft:diamond_block"
        }
      }
    },
    {
      "condition": "minecraft:location_check",
      "offsetX": -1,
      "offsetY": -1,
      "offsetZ": 0,
      "predicate": {
        "block": {
          "blocks": "minecraft:end_stone"
        }
      }
    },
    {
      "condition": "minecraft:location_check",
      "offsetX": 1,
      "offsetY": -1,
      "offsetZ": 0,
      "predicate": {
        "block": {
          "blocks": "minecraft:end_stone"
        }
      }
    },
    {
      "condition": "minecraft:location_check",
      "offsetX": 0,
      "offsetY": -1,
      "offsetZ": -1,
      "predicate": {
        "block": {
          "blocks": "minecraft:end_stone"
        }
      }
    },
    {
      "condition": "minecraft:location_check",
      "offsetX": 0,
      "offsetY": -1,
      "offsetZ": 1,
      "predicate": {
        "block": {
          "blocks": "minecraft:end_stone"
        }
      }
    }
  ]
}```