The poetry in mkPoetryEnv doesn't end up with the correct python version

[MatrixManAtYrService]

Describe the issue

Poetry ends up configured to use python 3.10 even though I've specified python 3.8:

$ nix develop
trace: warning: 'deps' argument to makeSetupHook is deprecated and will be removed in release 23.11., Please use propagatedBuildInputs instead. content of deps: /nix/store/micahg85qjjalavnrjsv6yip8m1m4qds-python3.10-pip-23.0.1 /nix/store/if8hmh5jb452r7xrqdabc83gdazx825n-python3.10-wheel-0.38.4
$ poetry run python --version
Python 3.10.9

I'm not sure what's up with that warning, but I've found that I can work around the above error by running:

$ poetry env use $(which python)

...which I suppose I could do in a shellHook, but it seems like there should be a better way.

Additional context

default.nix/shell.nix/flake.nix:

{
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    poetry2nix = {
      url = "github:nix-community/poetry2nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, poetry2nix, }:
      {
        overlay = nixpkgs.lib.composeManyExtensions [

          poetry2nix.overlay

          (final: prev: 
          let 
            projectDir = ./.;
            python = prev.python38;
          in
          {
            myapp = final.poetry2nix.mkPoetryApplication {
              inherit projectDir;
              inherit python;
              preferWheels = true;
            };
            myenv = final.poetry2nix.mkPoetryEnv {
              inherit projectDir;
              inherit python;
            };
          })
        ];
      } // flake-utils.lib.eachDefaultSystem (system:
      let 
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ self.overlay ];
        };
      in rec {
        packages = {
          myapp = pkgs.myapp;
          default = self.packages.${system}.myapp;
        };

        devShells.default = pkgs.mkShell {
          buildInputs = [
            pkgs.myenv
          ];
          packages = [
            pkgs.poetry
            pkgs.python38
            pkgs.pre-commit
          ];
        };
      });
}

pyproject.toml:

[tool.poetry]
...omitted...

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

[tool.poetry.dependencies]
python = "^3.8"

[MatrixManAtYrService]

After some further investigation, I think maybe this is the cause: NixOS/nixpkgs#223275

But I'd love a second opinion about that.

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/is-there-a-bsd-equivalent-of-coretools/27257/6

[MatrixManAtYrService]

I'm pretty sure that the above issue was indeed the cause.