makeBinPath takes care to use the correct output.

nix-repl> lib.makeSearchPath "bin" [pkgs.nix] "/nix/store/zpp83pr21ihxwsr15l6mkzwkr49zj71d-nix-1.11.2-dev/bin"

nix-repl> lib.makeBinPath [pkgs.nix] "/nix/store/9n8c3g541qn43yjjs94f1a0m69wp8scg-nix-1.11.2/bin"