MineAssets/1.16.5/assets/minecraft/models/block/chain_command_block_conditional.json

{
  "parent": "minecraft:block/template_command_block",
  "textures": {
    "front": "minecraft:block/chain_command_block_front",
    "back": "minecraft:block/chain_command_block_back",
    "side": "minecraft:block/chain_command_block_conditional"
  }
}