The #default_value key is not correct for number_path_truncate. So it will not reflect the current config correctly.
$form['options']['numbering']['number_path_truncate'] = [
'#title' => $this->t('Truncate the numbering path to only display parents.'),
'#type' => 'checkbox',
'#default_value' => $options['number_path'],
];
Try to change the config of number_path_truncate. The form will not reflect the value correctly.
Fix #detault_value in the form.
Active
1.0
Code