Nested property type lost when accessed from reference

还没有人认领这个 Issue。

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Type Checking

### Expected Behaviour

``` ---@class A
local A = {}

---@class B
---@overload fun(): B
local B = {}

---@class C
---@overload fun(): C
local C = {}

A.property1 = B()

A.property1.property2 = C()

local refToB = A.property1

local refToC = refToB.property2
```

while the local `refToB` is correctly of type `B`, it no longer is aware of property2.


expected behavior would be that it is aware of the properties assigned to the instance.

### Actual Behaviour

presence of property is lost in the "instance" of object B (not definition).

### Reproduction steps

1. Go to '...'
2. Click '...'
3. See error '...'

### Additional Notes

_No response_

### Log File

_No response_

从 issue 中的 Lua 类型检查示例开始，通过对 A.property1、refToB 和 refToC 的赋值复现缺失的属性信息。跟踪相关的类型检查行为，直到 refToB 保留 property2 且 refToC 解析为 C；issue 中未指明任何 repository 文件或测试。

由索引模型根据 Issue 内容生成。