Problem with terrain_matching generation

I'm making a datapack that introduces jungle villages into the game, I have now added road generation with the terrain_matching projection, but the road blocks match the short and tall grass making the road incredibly bumpy, I have messed around with creating a custom processor for this but had no success so far.
This is the processor json if it helps:
{
  "processors": [
    {
      "processor_type": "minecraft:rule",
      "rules": [
        {
          "input_predicate": {
            "block": "minecraft:air",
            "predicate_type": "minecraft:block_match"
          },
          "location_predicate": {
            "predicate_type": "minecraft:always_true"
          },
          "output_state": {
            "Name": "minecraft:air"
          }
        },
        {
          "input_predicate": {
            "block": "minecraft:air",
            "predicate_type": "minecraft:block_match"
          },
          "location_predicate": {
            "predicate_type": "minecraft:always_true"
          },
          "output_state": {
            "Name": "minecraft:air"
          }
        }
      ]
    }
  ]
}```