Exact Class with `__index` Assignment Result in Loss of All Class Methods

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?

Completion, Hover

Expected Behaviour

Method :method and :method2 is shown.

Actual Behaviour

No method is shown.

Reproduction steps

Test code:

---@class (exact) Foo
local Foo = {}
Foo.__index = Foo ---@diagnostic disable-line inject-field

function Foo:method()
end

function Foo:method2(value)
end

---@return Foo
local function foo()
end

local b = foo()

Variable b has type of Foo. However typing b: won't show method and method2. The self variable inside Foo:nethod and Foo:method2 will also have same issue if used.

Removing the (exact) make it work works as expected. Removing the __index assignment also make it works as expected. However, silencing the __index inject field with ---@field __index Foo instead of using ---@diagnostic still result in same issue.

Hovering to b also won't show any of the methods. However hovering to Foo works.

Additional Notes

Typing the method name manually (e.g. :method2) will show completion normally and will make b show method2 after it's used once. But only method2 in that specific case. method still not be shown.

Log File

file_d%3A_Data_Development_love-11.3-win64_luals-report.log

重现提供的 Lua 代码片段，并检查带有 __index 赋值的 exact 类的补全和悬停行为。以报告中 exact 类与 non-exact 类之间的差异作为比较的起点。当 Foo 方法在 b 和 self 的补全和悬停中出现，且不需要先输入方法名时，即表示完成。