Neovim LSP autocompletes everything twice.

[mmkumr]

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Minimal reproducible full config

set nocompatible
syntax on

call plug#begin('~/.config/nvim/plugged')

Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/vim-vsnip'

call plug#end()

lua <<EOF
local cmp = require 'cmp'

cmp.setup {
  snippet = {
    expand = function(args)
      vim.fn['vsnip#anonymous'](args.body)
    end,
  },
  sources = {
    { name = 'buffer' },
    { name = 'vsnip' },
  },
}
EOF

Description

Neovim LSP autocompletes everything twice.

Steps to reproduce

1. Tried installing nvim-cmp with Plug and Lazy package managers.
2. Tried removing all the snippets in the snippet file.
3. Tried with other programming language like python. But this problem only occurs when code is autocompleted using the snippet provided by LSP.