How to test input form that sends chat on Enter with React Testing Library?

I have the following Chat box that sends the chat when someone clicks on Enter. This is working as expected in normal life but RTL is disagreeing.

import React, { useState } from "react";

export default function Test() {
  const [chatText, setChatText] = useState("");

  function sendChat() {
    setChatText("");
  }

  return (
    <div>
      <textarea
        rows={2}
        value={chatText}
        onChange={(e) => {
          setChatText(e.target.value);
        }}
        onKeyDown={(e) => {
          if (e.key === "Enter" && !e.shiftKey) {
            e.stopPropagation();
            e.preventDefault();
            sendChat();
          }
        }}
        aria-label="chat-input"
      />
      <button onClick={sendChat}>Send</button>
    </div>
  );
}

This is working fine. You send a text and the chat box clears when you press Enter.

The following is the test I have written in RTL, but it is not working.

import React from "react";
import { render, screen, waitFor, act } from "@testing-library/react";
import "@testing-library/jest-dom";
import user from "@testing-library/user-event";

import Test from "./index";

describe("Chat", () => {
  test("clear text on Enter", async () => {
    render(<Test />);
    let textBox = screen.getByLabelText("chat-input");
    await act(async () => {
      textBox.focus();
      expect(textBox).toHaveFocus();
      await user.keyboard("hello");
      await user.keyboard("{Enter}");
      await user.keyboard("hello");
      await waitFor(() => {
        expect(textBox).toHaveValue("hello");
      });
    });
  });
});

Is the test I've written wrong or is something wrong with the code? RTL is not triggering the clear on Enter part, instead is showing hellohello

from How to test input form that sends chat on Enter with React Testing Library?