How to make a third-party member function as deprecated

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?

Diagnostics/Syntax Checking

Expected Behaviour

---@deprecated
M.add = M.add

The left one should have marked as deprecated immediately when used such as u:add

Actual Behaviour

1. it not works first.
   
2. and works unexpectedly.
   

Reproduction steps

1. Write the code

-- File A

---@class A
local A = {}

---@param attr string
function A.add(attr)
end

-- File B

---@class A
local B = A

---@deprecated
B.add = A.add

B.add('some attr')

We'll find that B.add havn't marked as deprecated
2. Keep write the followed

-- File C

---@class A
---@field add fun(attr: string)
local C = A

Additional Notes

My original intention was to mark a third-party member function as deprecated.
As there was no straightforward way, I think, to do it, I had to use a lot of tricks, which led to more subsequent problems.

Log File

No response

issue にある File A、File B、File C の再現から始め、非推奨の代入後に診断が B.add をどのようにマークするかに注目してください。Visual Studio Code 拡張機能で再現を実行し、観測された診断を B.add に対して期待される非推奨警告と比較してください。