Is Rust package fully working?

[bubuntux]

I just installed astronvim with the rust community package and doesn't seems fully functional,
it is not able to display documentation of built-in methods such as trim or chars for a string, also the autocomplete doesn't suggest them i think there is something missing on the LSP.

setup

docker run -w /root -it --rm alpine:edge sh -uelic '
  apk add bash git lua nodejs npm lazygit bottom python3 go neovim ripgrep alpine-sdk rust cargo rustfmt --update
  git clone --depth 1 https://github.com/AstroNvim/AstroNvim ~/.config/nvim
  mkdir -p ~/.config/nvim/lua/user/plugins/
  echo "return { \"AstroNvim/astrocommunity\", { import = \"astrocommunity.pack.rust\" }, }" >> ~/.config/nvim/lua/user/plugins/community.lua
  cargo init abc
  nvim abc/src/main.rs
'

after it finish to load and install all the dependencies the LSP wont start automatically since it just got installed so we need to manually start it using

:LspStart rust-analyzer 

after that a lot of things work out-of-the-box like syntax, formatting, errors/warnings and such, but if you type "ABC". it won't suggest methods such as trim or chars and when manually typed them and then try to get the documentation about them using K nothing happens.

Am i missing something obvious?

[M-Komorek]

Same problem with Rust package. In addiction, the same behavior occurs for example for cpp pack.
Any idea how to solve it? Are we missing something obvious?