form validate the field which is not exist after I remove it about antd-form-builder HOT 6 CLOSED

import React, { useState } from "react";
import { Form, Button } from "antd";
import FormBuilder from "antd-form-builder";

export default Form.create()(({ form }) => {
  const handleSubmit = e => {
    e.preventDefault();
    form.validateFields((err, values) => {
      if (!err) {
        console.log("Received values of form: ", values);
      }
    });
  };
  const [fields, setFields] = useState([
    {
      key: "username",
      label: "User Name",
      rules: [
        {
          required: true
        }
      ]
    },
    { key: "password", label: "Password", widget: "password" }
  ]);

  return (
    <Form onSubmit={handleSubmit}>
      <FormBuilder
        meta={{
          fields
        }}
        form={form}
      />
      <Form.Item wrapperCol={{ span: 16, offset: 8 }}>
        <Button type="primary" htmlType="submit">
          Log in
        </Button>
      </Form.Item>
      <Button
        onClick={() => {
          setFields([
            { key: "password", label: "Password", widget: "password" }
          ]);
        }}
      >
        remove
      </Button>
    </Form>
  );
});

import React, { useCallback } from "react";
import { Form, Button } from "antd";
import FormBuilder from "antd-form-builder";

export default Form.create()(({ form }) => {
  const handleSubmit = useCallback(
    evt => {
      evt.preventDefault();
      form.validateFields((err, values) => {
        if (!err) {
          console.log("Received values of form: ", values);
        }
      });
    },
    [form]
  );

  const meta = [
    {
      key: "favoriteFruit",
      label: "Favorite Fruit",
      widget: "radio-group",
      options: ["Apple", "Orange", "Other"],
      initialValue: "Apple"
    }
  ];

  // Push other input if choose others
  if (form.getFieldValue("favoriteFruit") === "Other") {
    meta.push({
      key: "otherFruit",
      label: "Other",
      rules: [
        {
          required: true
        }
      ]
    });
  }

  return (
    <Form onSubmit={handleSubmit}>
      <FormBuilder meta={meta} form={form} />
      <Form.Item wrapperCol={{ span: 16, offset: 8 }}>
        <Button type="primary" htmlType="submit">
          Submit
        </Button>
      </Form.Item>
    </Form>
  );
});