Undefined index: nested_parenthesis

Problem/Motivation

I have a codebase that fails during a phpcbf run due to an error with nested_parenthesis. When I comment out the code in vendor/drupal/coder/coder_sniffer/DrupalPractice/Sniffs/General/OptionsTSniff.php, the error goes away (temporarily). Once I get all the way through the phpcbf run (without errors) and uncomment the nested_parenthesis code, it no longer causes errors. It sounds like maybe the "other" fixes resolve whatever is causing the nested_parenthesis rules to fail?

The error I see is:

PHP Fatal error:  Uncaught PHP_CodeSniffer\Exceptions\RuntimeException: Undefined index: nested_parenthesis in /vendor/drupal/coder/coder_sniffer/DrupalPractice/Sniffs/General/OptionsTSniff.php on line 69 in /vendor/squizlabs/php_codesniffer/src/Runner.php:606
Stack trace:
#0 /vendor/drupal/coder/coder_sniffer/DrupalPractice/Sniffs/General/OptionsTSniff.php(69): PHP_CodeSniffer\Runner->handleErrors(8, 'Undefined index...', '...', 69, Array)
#1 /vendor/squizlabs/php_codesniffer/src/Files/File.php(496): DrupalPractice\Sniffs\General\OptionsTSniff->process(Object(PHP_CodeSniffer\Files\LocalFile), 88)
#2 /vendor/squizlabs/php_codesniffer/src/Files/LocalFile.php(91): PHP_CodeSniffer\Files\File->process()
#3 /vendor/squizlabs/php_codesniffer/src/Fixer.php(174): PHP_CodeSniffer\Files\LocalFile->proces in /vendor/squizlabs/php_codesniffer/src/Runner.php on line 606

This undefined index seems to be thrown when both the long and short array declarations are used. For example:

$form['example'] = [
  '#options' => array(
    1 => t('Enabled'),
    0 => 'Disabled',
  ),
];