ts-codegen: Ts-codegen doesn't recognize types by reference

I have the execute message defined as such

#[derive(sylvia::serde::Serialize, Clone, Debug, PartialEq, sylvia::schemars::JsonSchema)]
#[serde(rename_all = "snake_case", untagged)]
pub enum ContractExecMsg {
    Cw1(cw1::Cw1ExecMsg),
    Whitelist(whitelist::WhitelistExecMsg),
    Cw1WhitelistContract(ExecMsg),
}

This is a wrapper of three messages that my contract should support.

Schema.json generated for it (using write_api!) is:

  "execute": {
    "$schema": "http://json-schema.org/draft-07/schema#",
    "title": "ExecuteMsg",
    "anyOf": [
      {
        "$ref": "#/definitions/Cw1ExecMsg"
      },
      {
        "$ref": "#/definitions/WhitelistExecMsg"
      },
      {
        "$ref": "#/definitions/ExecMsg"
      }
    ],
    "definitions": 
    ...
      "Cw1ExecMsg": {
        "oneOf": [
          {
            "type": "object",
            "required": [
              "execute"
            ],
            "properties": {
              "execute": {
                "type": "object",
                "required": [
                  "msgs"
                ],
                "properties": {
                  "msgs": {
                    "type": "array",
                    "items": {
                      "$ref": "#/definitions/CosmosMsg_for_Empty"
                    }
                  }
                }
              }
            },
            "additionalProperties": false
          }
        ]
      },
    ...

So we have execute defined as any of theses three messages which are defined in definitions section. But when I ran

cosmwasm-ts-codegen generate \
          --plugin client \
          --schema ./schema \
          --out ./ts \
          --name whitelist \
          --no-bundle

I get

node:internal/process/promises:289
            triggerUncaughtException(err, true /* fromPromise */);
            ^

MissingPointerError: Token "Cw1ExecMsg" does not exist.
    at Pointer.resolve (/usr/lib/node_modules/@cosmwasm/ts-codegen/node_modules/@pyramation/json-schema-ref-parser
}

It looks like ts-codegen doesn’t understand ref to definition.