Can not preview jdt:// files

[RuochenFu21]

Description

preview of jdt:// files are empty

Neovim version

NVIM v0.11.5
Build type: Release
LuaJIT 2.1.1764270282

Operating system and version

macOS 26.1

Telescope version / branch / rev

telescope 0.1.8

checkhealth telescope

==============================================================================
telescope:                                                                  ✅

Checking for required plugins ~
- ✅ OK plenary installed.
- ✅ OK nvim-treesitter installed.

Checking external dependencies ~
- ✅ OK rg: found ripgrep 15.1.0
- ✅ OK fd: found fd 10.3.0

===== Installed extensions ===== ~

Telescope Extension: `fzf` ~
- ✅ OK lib working as expected
- ✅ OK file_sorter correctly configured
- ✅ OK generic_sorter correctly configured

Steps to reproduce

1. Install JDTLS
2. Run :Telescope lsp_dynamic_workspace_symbols
3. Search for anything

Expected behavior

Actual behavior

Minimal config

local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs { "config", "data", "state", "cache" } do
  vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.uv.fs_stat(lazypath) then
  vim.fn.system {
    "git",
    "clone",
    "--filter=blob:none",
    "https://github.com/folke/lazy.nvim.git",
    lazypath,
  }
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
  {
    "nvim-telescope/telescope.nvim",
    dependencies = {
      "nvim-lua/plenary.nvim",
    },
    config = function()
      -- ADD INIT.LUA SETTINGS THAT ARE _NECESSARY_ FOR REPRODUCING THE ISSUE
      require("telescope").setup {}
    end,
  },
}

require("lazy").setup(plugins, {
  root = root .. "/plugins",
})

[RuochenFu21]

Where exactly is this catched? I don't think previewers.buffer_previewer_maker is called in this case, is this expected behaviour?