Functions and commands are unavailable after migrating from packer.nvim

[calon]

Switched from packer to Lazy, all plugins loaded from local path, like:
{ dir = "$VIM/plugin/plenary.nvim" },
{ dir = "$VIM/plugin/telescope.nvim" },

Lazy health check OK.
But all the functions and commands in plugins are not available.
For example, I can call lua require('telescope.builtin').oldfiles() to trigger Telescope, but the ":Telescope" command returns E492 error, not an editor command.
Why would this happen, or what info should I provide?

[calon]

Changed the plugin settings, from local to installing from repository, and it works.
But still wonder why.
Local plugin is loaded, lua functions are available, so the local path written in config file is right.
What else could be wrong?