Bamboo sapling is not in the #minecraft:saplings block tag

{
  "replace": false,
  "values": [
    "minecraft:oak_sapling",
    "minecraft:spruce_sapling",
    "minecraft:birch_sapling",
    "minecraft:jungle_sapling",
    "minecraft:acacia_sapling",
    "minecraft:dark_oak_sapling"
  ]
}