Steps To Reproduce

Steps to reproduce the behavior:

1. nixpkgs.config.contentAddressedByDefault = true;
2. programs.firefox.package = pkgs.wrapFirefox pkgs.firefox-devedition-unwrapped {};
3. try to build

Build log

error: derivation contains an illegal reference specifier '/1bvljsyksz1ppvcn25gs1jbdbb0qp0a3j65js5vhc7hmd22pwp1a

Additional context

I also have march/mtune set and can't/won't use firefox-bin

  nixpkgs.hostPlatform = {
    gcc.arch = "znver3";
    gcc.tune = "znver3";
    system = "x86_64-linux";
  };

Notify maintainers

@jopejoe1 @mweinelt @lovesegfault

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