silphius/public/assets/hoe/projection-check.js

const layer0 = ecs.get(1).TileLayers.layer(0)
const layer1 = ecs.get(1).TileLayers.layer(1)

const filtered = []

for (const position of projected) {
  if (
    [1, 2, 3, 4, 6].includes(layer0.tile(position))
    && ![7].includes(layer1.tile(position))
  ) {
    filtered.push(position)
  }
}

return filtered