antd的form的shouldUpdate执行了validator没有执行

a和b的校验都相互依赖，这里用shouldUpdate去做，结果shouldUpdate执行了，对应的validator没有执行。这种应该怎么处理？
<Form.Item
noStyle
shouldUpdate={(pre: any, current: any) => {
const result = JSON.stringify(pre.a) !== JSON.stringify(current.a)
|| JSON.stringify(pre.b) !== JSON.stringify(current.b);
console.log('shouldUpdate', result);
return result;
}}
>
{
() => (
<Form.Item name="a" label="a方式" required rules={[
({ getFieldValue }) => ({
validator(_, value) {
// 依赖b
console.log('validate);
},
})]}>
<Radio.Group disabled={disabled}>
<Radio value={'ddd'}>ddd
<Radio value={'xxx'}>xxx
</Radio.Group>
</Form.Item>
)
}
</Form.Item>

Reproduce the supplied Form.Item example with fields a and b, then inspect the shouldUpdate and validator behavior in the form implementation. Confirm whether changing either dependent field invokes the validator, and finish with the expected behavior covered by a regression test.