{
  "format_version": "1.13.0",
  //They're broken: always have been. They don't throw errors, but they don't reposition based on input/output. No errors are thrown, it just doesn't do its job. The schema is correct.
  "minecraft:single_block_feature": {
    "description": {
      "identifier": "sequence_features:sequence_feature_planks"
    },

    "places_block": "minecraft:planks",

    "enforce_placement_rules": false,
    "enforce_survivability_rules": false
  }
}