save-space! gives existence error on get_atoms

[AdrickTench]

save-space! gives an existence error for its internal method get_atoms.
e.g. !(save-space! &self "test-save-space.metta") will give an error

...
  Call: (85) [user] forall(get_atoms('&self', _214210), write_src(_214210))
^  Unify: (85) [$apply] forall(user:get_atoms('&self', _214210), user:write_src(_214210))
   Call: (86) [user] get_atoms('&self', _214210)
% Got uncaught (guard = 'C') exception existence_error(procedure,get_atoms/2) (Ctx0='$apply':forall/2)
   Exception: (86) [user] get_atoms('&self', _214210) ? goals
     [86] [user] get_atoms('&self', _214210)
     [85] [$apply] forall(user:get_atoms('&self', _214210), user:write_src(_214210))
     [84] [system] '$c_call_prolog'
     [83] [user] with_output_to(<stream>(0x56494c26eba0), forall(get_atoms('&self', _214210), write_src(_214210)))
     [82] [system] setup_call_cleanup(user:open("my-test.metta", write, <stream>(0x56494c26eba0), []), user:with_output_to(<stream>(0x56494c26eba0), forall(get_atoms('&self', _214210), write_src(_214210))), user:close(<stream>(0x56494c26eba0)))
   Exception: (86) [user] get_atoms('&self', _214210) ?

The implementation

'save-space!'(Space, File) :-
    setup_call_cleanup(
        % Open the specified File in write mode.
        open(File, write, Out, []),
        % Write all atoms from the Space to the file using with_output_to/2.
        with_output_to(Out,
            % For each atom retrieved from the space, write it to the file.
            forall(get_atoms(Space, Atom), write_src(Atom))),
        % Ensure the output stream is closed after writing.
        close(Out)).