Adding packloadall to init.vim leads to E492: Not an editor command: Telescope

[cmoralesmx]

Description

I am trying to setup neovim to use Telescope together with dense-analysis/ale. According to their instructions I need to add packloadall to the very end of the init.vim file. When I do it and I run :Telescope find_files, I get the error:

E492: Not an editor command: Telescope find_files

If I remove the instruction packloadall, Telescope work as expected, I can search my files the usual way.
I have tested this several times and I have reproducibility even with a clean nvim environment.

Neovim version

:version                                                                                                  
NVIM v0.8.0
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by builduser

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info

Operating system and version

Arch Linux, kernel 6.02

Telescope version / branch / rev

telescope 0.1.0

checkhealth telescope

[No Name]  [Scratch]                                                                                              X

telescope: require("telescope.health").check()
========================================================================
## Checking for required plugins
  - OK: plenary installed.
  - WARNING: nvim-treesitter not found. 
 
## Checking external dependencies
  - OK: rg: found ripgrep 13.0.0
  - WARNING: fd: not found. Install [sharkdp/fd](https://github.com/sharkdp/fd) for extended capabilities
 
## ===== Installed extensions =====

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[Scratch]                                                                                         12,36          All
-- VISUAL --                                                                                             11

Steps to reproduce

1. Install vim-plug according to their instructions by doing

sh -c 'curl -fLo "${XDG_DATA_HOME:-$HOME/.local/share}"/nvim/site/autoload/plug.vim --create-dirs \
       https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim'

2. nvim -nu ~/.config/nvim/init.vim
3. :PlugInstall
4. checkhealth telescope same with uppercase Telescope
5. :qa!
6. nvim -nu ~/.config/nvim/init.vim
7. :Telescope find_files

Expected behavior

I expect to get Telescope's search window

Actual behavior

E492: Not an editor command: Telescope find_files

Minimal config

call plug#begin()
Plug 'nvim-lua/plenary.nvim'
Plug 'nvim-telescope/telescope.nvim', { 'tag': '0.1.0'}

call plug#end()
packloadall