blockstates -> spore_endstone.json

{
  "forge_marker": 1,
  "defaults": {
    "textures": {
      "all": "contenttweaker:blocks/spore_endstone_up"
    },
    "model": "contenttweaker:spore_endstone_block",
    "uvlock": true,
    "transform": "forge:default-block"
  },
  "variants": {
    "normal": [{}],
    "inventory": [{}]
  }
}