Multipe parameters infer differently?

Nobody has claimed this yet.

Infers `a` and `aa` correctly but not the rest
```lua
---@diagnostic disable: codestyle-check, spell-check, unused-local

---@alias AnyChild A|B|C
---@class PARENT
local PARENT = {}
---@class A: PARENT
local A = {}
---@class B: PARENT
local B = {}
---@class C: PARENT
local C = {}

---@overload fun(self:PARENT): A
---@overload fun(self:AnyChild, other: A): A
---@overload fun(self:AnyChild, other: B): B
function PARENT:new(other)
self.a = 2
return {}
end

local a = A:new()
local aa = a:new()

local aaa = a:new(B)
local b = B:new(B)
local bb = b:new(B)
local bbb = b:new(C)
```

Start with the embedded Lua reproduction and inspect the language server's inferred types for `aaa`, `b`, `bb`, and `bbb` compared with `a` and `aa`. Trace overload resolution for colon calls and multiple parameters, then add or run a focused regression test that confirms the expected inferred types for all examples.

Written by the indexing model from the issue text.