Using the buffer plugin more than once with different options doesn't work

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Minimal reproducible full config

if has('vim_starting')
  set encoding=utf-8
endif
scriptencoding utf-8

if &compatible
  set nocompatible
endif

let s:plug_dir = expand('/tmp/plugged/vim-plug')
if !filereadable(s:plug_dir .. '/plug.vim')
  execute printf('!curl -fLo %s/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim', s:plug_dir)
end

execute 'set runtimepath+=' . s:plug_dir
call plug#begin(s:plug_dir)
Plug 'hrsh7th/nvim-cmp'
Plug 'hrsh7th/cmp-buffer'
Plug 'hrsh7th/cmp-nvim-lsp'
Plug 'hrsh7th/vim-vsnip'
Plug 'neovim/nvim-lspconfig'
call plug#end()
PlugInstall | quit

" Setup global configuration. More on configuration below.
lua << EOF
local cmp = require "cmp"
cmp.setup {
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },

  mapping = {
    ['<CR>'] = cmp.mapping.confirm({ select = true })
  },

  sources = {
    { name = "buffer", group_index = 1, option = { keyword_pattern = [[\k\+]] } },

    -- If nothing else matches, complete words from other buffers
    {
      name = "buffer",
      group_index = 2,
      option = {
        keyword_pattern = [[\k\+]],
        get_bufnrs = function()
          return vim.api.nvim_list_bufs()
        end
      },
    },
  },
}
EOF

lua << EOF
local capabilities = require('cmp_nvim_lsp').default_capabilities()

require'lspconfig'.cssls.setup {
  capabilities = capabilities,
}
EOF

Description

I often have a lot of buffers open, so I don't want to show buffer keywords from all my buffers.

However, I want to fall back to showing keywords from all buffers if there's nothing else to complete. This doesn't work. It seems like any sources after the first one of the same type is just ignored.

Steps to reproduce

Use these sources:

  sources = {
    { name = "buffer", group_index = 1, option = { keyword_pattern = [[\k\+]] } },

    -- If nothing else matches, complete words from other buffers
    {
      name = "buffer",
      group_index = 2,
      option = {
        keyword_pattern = [[\k\+]],
        get_bufnrs = function()
          return vim.api.nvim_list_bufs()
        end
      },
    },
  },

Test with:

file1.txt:

VERY

file2.txt:

VERY_LONG_KEYWORD

Place the cursor on a new line in file1.txt and start typing VE, a completion for VERY is suggested. When you keep typing VERY_L then the keyword from file2.txt should be suggested, but it isn't.

Expected behavior

When typing, keywords from the current buffer should be suggested. If the text doesn't match any keywords in the current buffer, keywords from all buffers should be suggested.

Actual behavior

Additional context

No response

hrsh7th / nvim-cmp