lib.getExe is broken when contentAddressedByDefault = true;

[wanderer]

Describe the bug

using the repl with a flake that has contentAddressedByDefault = true;

nix-repl>:lf .
nix-repl d = nixosConfigurations.mymachine.pkgs.writeShellApplication { name = "test"; text = "";}
nix-repl> d
[2 built, 0.0 MiB DL]«derivation /nix/store/fwy3r5aff49bfig1w5iw2lw3kjbwajbx-test.drv»

nix-repl> nixosConfigurations.mymachine.lib.getExe d
"/1h39q25ll13mw8b6kiw6jw87amsx6sw25apckma7kmpgrq044414/bin/test"

nix-repl> :b d

This derivation produced the following outputs:
  out -> /nix/store/1ynn7k5yd6v9g378r8m8y3ig2i80dym5-test
[2 built, 0.0 MiB DL]

Expected behavior

getExe should return /nix/store/1ynn7k5yd6v9g378r8m8y3ig2i80dym5-test/bin/test

Metadata

nix-env (Nix) 2.24.12

Checklist

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

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