Returning generics with `T<X, Y>`

Below, I have a generic list that uses fluid interface to return itself for some methods:

--- @class List
local List = {}

--- @generic T : List, V, _
--- @param self T<V, _>
--- @param value V         # Element value to insert
--- @return T<V, _>        # Returning itself (a generic)
function List:insert(value)
    return self           -- Returning itself (a generic)
end

-- test
---@type List<number, nil>
local mylist

local testingType = mylist:insert(1)
-- ^ Testing type is not `List<number, nil>` but literally `T<V, _>`

Expected behavior
testingType is of type List<number, nil>

I am thinking that this case could be something to look at for the 3.0 update.

(Edit: perfect #1000th issue...)

The payload names no source file or test. Start by reproducing the provided List:insert example and compare the inferred type with the expected List<number, nil>; then trace generic return-type inference and add a regression test confirming the result is no longer the literal T<V, _>.