How to properly setup ffmpeg for nix

how can i properly setup ffmpeg in replit? my application has web UI elements using python and i already added audio player but the problem is it seems its not working properly so i add this in nix file to fix the ffmpeg

{ pkgs, ... }: {
  deps = [
    pkgs.run
    pkgs.ffmpeg
  ];
  environment.systemPackages = [ pkgs.libopus ];
}

but when i am running the application the nix file is turning to this

{ pkgs, ... }: {
  deps = [
    pkgs.xsimd
    pkgs.pkg-config
    pkgs.libxcrypt
    pkgs.ffmpeg-full
    pkgs.run
    pkgs.ffmpeg
  ];
  
  env = {
    PYTHON_LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
      pkgs.xsimd
      pkgs.libxcrypt
    ];
  };environment.systemPackages = [ pkgs.libopus ];
}

and the error now is this

Traceback (most recent call last):
 File "/home/runner/musicgen/main.py", line 1, in <module>
   import torch
 File "/home/runner/musicgen/.pythonlibs/lib/python3.10/site-packages/torch/__init__.py", line 228, in <module>
   _load_global_deps()
 File "/home/runner/musicgen/.pythonlibs/lib/python3.10/site-packages/torch/__init__.py", line 187, in _load_global_deps
   raise err
 File "/home/runner/musicgen/.pythonlibs/lib/python3.10/site-packages/torch/__init__.py", line 168, in _load_global_deps
   ctypes.CDLL(lib_path, mode=ctypes.RTLD_GLOBAL)
 File "/nix/store/xf54733x4chbawkh1qvy9i1i4mlscy1c-python3-3.10.11/lib/python3.10/ctypes/__init__.py", line 374, in __init__
   self._handle = _dlopen(self._name, mode)
OSError: libstdc++.so.6: cannot open shared object file: No such file or directory

i am not sure why the nix file is changing its should not change right? i already run poetry lock no upgrade

This is probably a side effect bug of:

You can report it there.
In the meantime, turning off Explorer mode in account settings will disable this feature, which should fix the problem.

Edit:
Replit is going to fix it, the feature has been disabled until they fix it.