Nix flake show output broken

[simonzkl]

Describe the bug

There's a bunch of regressions in nix flake show since upgrading from dnix 3.9.1 to 3.11.1

├───apps
│   ├───aarch64-darwin
│   │   └───jq: app 'app'

^ app is no longer picking up meta.description

├───checks
│   ├───aarch64-darwin
│   │   ├───installerScriptForGHA: derivation 'derivation 'installer-script''

^ derivation is printed twice

│   ├───aarch64-linux
│   │   ├───default: omitted 'omitted (use '--all-systems' to show)'

^ omitted is printed twice

Steps To Reproduce

1. Clone https://github.com/DeterminateSystems/nix-src
2. Run nix flake show --no-eval-cache

Optionally add an app to the flake to see the broken meta.description behaviour:

apps = forAllSystems (
  system: {
    jq = {
      type = "app";
      program = lib.getExe nixpkgsFor.${system}.native.jq;
      meta.description = "foo";
    };
  }
);

Expected behavior

Should not have these regressions.

Metadata

Determinate Nixd daemon version: 3.11.1
Determinate Nixd client version: 3.11.1

You are running the latest version of Determinate Nix.

The following features are enabled:

 * lazy-trees

Visit https://dtr.mn/features for more information.

nix (Determinate Nix 3.11.1) 2.31.1

Additional context

Run nix run nixpkgs#nixVersions.nix_2_31 -- flake show --no-eval-cache and none of these issues appear. It also works fine in older versions of dnix, but I can't say for sure which version since 3.9.1 broke this.

Checklist

• checked latest Determinate Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

[edolstra]

The double printing was fixed in 35a8e60.

[simonzkl]

Yeah, I can confirm it no longer double-prints, though the meta.description output is still missing.