I never personally was able to make ASDF successfully build me a viable ERTS using only system-level dependencies provided by Nix, so I use the beamPackages that are already part of nixpkgs and (as you yourself already found) I offer some further niceties in shanesveller/nix-beam-flakes to support precise version-pinning to a particular Erlang/Elixir patch-level version.
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