Did you declaratively install vscode with the rust-analyzer nix-expression ( https://github.com/NixOS/nixpkgs/tree/3b6c3bee9174dfe56fd0e586449457467abe7116/pkgs/misc/vscode-extensions/rust-analyzer) or did you interactively install the extension from within the editor?
Some extensions are manually packaged in nixpkgs as to resolve dependencies explicitly and rust-analyzer is one of them.
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