error with show statement and non-domain atoms

[nrueh]

The following program gives an error

a(x).
{b(x)}.

&in{1..1} =: X :- a(X), b(X).

&show { X : b(X) }.

Replacing the show statement as follows works fine

&show { X : a(X) }.

Error message:

fclingo version 0.1
Reading from test.lp
Traceback (most recent call last):
  File "/Users/nicolasruhling/.pyenv/versions/miniconda3-3.12-24.1.2-0/envs/coom/lib/python3.12/site-packages/clingo/application.py", line 362, in _pyclingo_application_main
    app.main(Control(control), [_to_str(files[i]) for i in range(size)])
  File "/Users/nicolasruhling/.pyenv/versions/miniconda3-3.12-24.1.2-0/envs/coom/lib/python3.12/site-packages/fclingo/__main__.py", line 170, in main
    control.solve(on_model=self.on_model, on_statistics=self._theory.on_statistics)
  File "/Users/nicolasruhling/.pyenv/versions/miniconda3-3.12-24.1.2-0/envs/coom/lib/python3.12/site-packages/clingo/control.py", line 848, in solve
    _c_call(
  File "/Users/nicolasruhling/.pyenv/versions/miniconda3-3.12-24.1.2-0/envs/coom/lib/python3.12/site-packages/clingo/_internal.py", line 44, in _c_call
    _handle_error(c_fun(*args, p_ret), handler)
  File "/Users/nicolasruhling/.pyenv/versions/miniconda3-3.12-24.1.2-0/envs/coom/lib/python3.12/site-packages/clingo/_internal.py", line 75, in _handle_error
    raise RuntimeError(msg)
RuntimeError: Invalid Syntax: invalid show statement
*** ERROR: (fclingo): Invalid Syntax: invalid show statement
UNKNOWN

Models       : 0+
Calls        : 1
Time         : 0.014s (Solving: 0.00s 1st Model: 0.00s Unsat: 0.00s)
CPU Time     : 0.011s