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### Environment

* Dubbo version: 2.7.18
* Operating System version: macos
* Java version: 1.8

### Steps to reproduce this issue

1. 服务端采用dubbo泛化实现方式，服务端直接返回map类型的响应对象，响应对象中有list集合，list中返回的数据为map结构
2. 客户端正常调用，收到的响应数据list中的map结构没有转换为接口定义的实际java对象，导致程序做进一步处理报错
3. 经验证3.1.1 版本仍然存在该问题
4. 经排查后出问题的类为DecodeableRpcResult，代码段如下：
<img width="768" alt="image" src="https://user-images.githubusercontent.com/12338948/199507015-8b9ca5ed-17c6-475f-9190-6cf021f2dbea.png">
<img width="1115" alt="image" src="https://user-images.githubusercontent.com/12338948/199507116-9adc85b7-14c9-47c9-9b53-f94eec2f33c2.png">


Pls. provide [GitHub address] to reproduce this issue.
https://github.com/iloveoovo/dubbo-genericimpl-issue

### Expected Behavior

consumer端能正常反序列化

### Actual Behavior
consumer 端对于响应参数字段中List 字段的泛型处理错误

}
    /**
     * scenario: explicitly configure to add attachment
     * verify: id attribute added in attachment
     */
    @Test
    public void testAttachInvocationIdIfAsync_forceAttache() {
        URL url = URL.valueOf("dubbo://localhost/?" + AUTO_ATTACH_INVOCATIONID_KEY + "=true");
        Invocation inv = new RpcInvocation("test", "DemoService", "", new Class[] {}, new String[] {});
        RpcUtils.attachInvocationIdIfAsync(url, inv);
        assertNotNull(RpcUtils.getInvocationId(inv));
    }
    @Test
    public void testGetReturnType() {
        Class<?> demoServiceClass = DemoService.class;
        String serviceName = demoServiceClass.getName();
        Invoker invoker = mock(Invoker.class);
        given(invoker.getUrl()).willReturn(URL.valueOf(
                "test://127.0.0.1:1/org.apache.dubbo.rpc.support.DemoService?interface=org.apache.dubbo.rpc.support.DemoService"));
        
        RpcInvocation inv = new RpcInvocation("sayHello", serviceName, "", new Class<?>[] {String.class}, null, null, invoker, null);
        Class<?> returnType = RpcUtils.getReturnType(inv);
        Assertions.assertNull(returnType);
        
        RpcInvocation inv1 = new RpcInvocation("echo", serviceName, "", new Class<?>[] {String.class}, null, null, invoker, null);
        Class<?> returnType1 = RpcUtils.getReturnType(inv1);
        Assertions.assertNotNull(returnType1);
        Assertions.assertEquals(String.class, returnType1);
        
        RpcInvocation inv2 = new RpcInvocation("getSize", serviceName, "", new Class<?>[] {String[].class}, null, null, invoker, null);