Code completion does not work for non-ASCII module/function names

[xhh]

Environment

• Elixir & Erlang versions (elixir --version):

Erlang/OTP 25 [erts-13.0.4] [source] [64-bit] [smp:8:8] [ds:8:8:10] [asyn
c-threads:1] [jit:ns]

Elixir 1.14.3 (compiled with Erlang/OTP 23)

• Elixir Language Server version:

[Info  - 11:34:45] Started ElixirLS v0.13.0

• Operating system: Windows 10
• Editor or IDE name (e.g. Emacs/VSCode): VSCode
• Editor Plugin/LSP Client name and version: ElixirLS: Elixir support and debugger - v0.13.0

Current behavior

When a module/function name contains Chinese characters, e.g. :你好, code completion does not work well like ASCII names.

Reproduction steps:

1. Create a mix project: mix new hello
2. Open the created project in VSCode
3. Create a new file in the lib directory: 你好.ex, with content:

defmodule :你好 do
  def 运行 do
    IO.puts("你好")
  end
end

4. Open lib/hello.ex, add a new line below def hello do, then enter :你好., then press ctrl+space to trigger code completion.
5. It displays 无建议。 (No suggestions.)

Expected behavior

It should display a function list with 运行() included.

Screenshots

BTW the same code works in Livebook :

Other cases

If changing the module name to ASCII, e.g. :hello or MyHello, then :hello. will display 运行() in the completion list.
But :hello.运 will again display No suggestions.