Some custom snippet definitions do not work

[failable]

This snippet work in VSCode and Zed.

              "derive (serde)": {
                "prefix": ["ds"],
                "body": ["#[derive(Serialize, Deserialize)]$0"],
                "requires": ["serde::Serialize", "serde::Deserialize"],
                "scope": "item"
              },

This does not work in VSCode and Zed

              "thiserror": {
                "prefix": ["te"],
                "body": [
                  "#[derive(Error, Debug)]",
                  "pub enum ${1:Error} {",
                  "\t$0",
                  "}"
                ],
                "requires": ["thiserror::Error"],
                "scope": "item"
              }

However, this one works

          "thiserror": {
            "prefix": ["te"],
            "body": [
              "#[derive(Error, Debug)]",
              "pub enum ${1:Error} {",
              "\t$0",
              "}"
            ],
            "requires": ["serde::Serialize", "serde::Deserialize"],        // For testing
            "scope": "item"
          }

Why this thiserror dependency does not work? Thanks.