Question about `failed to find any projects in [AbsPathBuf("/projects/snippets")]`

Hello all,

using emacs 27.2 and lsp-mode

rust-analyzer --version 
rust-analyzer 4e72700e3 2022-02-28 dev

the lsp-server doesn't start with error
[ERROR rust_analyzer] failed to find any projects in [AbsPathBuf("/projects/snippets")]

It used to work in older versions(I can't recall the exact version).
and my project directory tree is like:

/projects/snippets  <-- git root 
/projects/snippets/projectA  //contains Cargo.toml, src/main.rs
/projects/snippets/projectB  //contains Cargo.toml, src/main.rs 
/projects/snippets/projectC  //contains Cargo.toml, src/main.rs

And in projectX the lsp doesn't start.

The rust_analyzer with debug is shown here.
https://pastebin.com/tjrdUtbP

thanks for any tips or ideas.

Start by reproducing the report with rust-analyzer 4e72700e3, Emacs 27.2, and lsp-mode against the shown /projects/snippets tree. Read the reported error and the linked debug output, then compare behavior for the repository root and its projectA/projectB/projectC subdirectories. Done means the cause of the project-discovery failure is identified and a concrete fix or clarified expected behavior is documented.