ARC predicts a wrong optical isomers number

Describe the bug
ARC uses the S. Patchkovskii brute force algorithm for determining symmetry and number of chiral centers. It gets the number of chiral centers wrong as reported here.
It also got it wrong for simle species such as [CH2]O.

How to reproduce
run:

from arc.common import determine_symmetry
from arc.species.converter import str_to_xyz


xyz = """
    O       0.75746700   -0.40970800    0.18629600
    C      -0.45247600    0.03076900   -0.24291600
    H      -1.23388100   -0.71100600   -0.17890300
    H      -0.49120400    0.82353200   -0.98028600
    H       1.42009400    0.26641200    0.03880800
"""


symmetry, optical_isomers = determine_symmetry(str_to_xyz(xyz))
print(optical_isomers)

Expected behavior
We should use the RDKit method implemented in the conformers module in ARC to perceive chirality.

Start with determine_symmetry and str_to_xyz using the provided [CH2]O reproduction, then inspect the conformers module where ARC already implements RDKit-based chirality perception. Replace the incorrect optical-isomer calculation with that method and confirm the reproduction reports the expected number of optical isomers.