Cannot access private property Nette\PhpGenerator\ClassType::$methods on Nette 3.1

[theo1024]

After upgrade to newer version of Nette 3.1 (on PHP 8.2) starts to appear this error message:

Error
Cannot access private property Nette\PhpGenerator\ClassType]::$methods

File: [.../vendor/olicek/form-selectize/src/SelectizeExtension.php:46]

36: // $builder = $this->getContainerBuilder();
37: // $builder->addDefinition($this->prefix('selectize'))
38: // ->setClass('\App\Form\Control\Selectize');
39: // }
40:
41:
42: public function afterCompile(Code\ClassType $class)
43: {
44: parent::afterCompile($class);
45:
46: $init = $class->methods['initialize'];
47: $config = $this->getConfig($this->defaults);
48: $init->addBody('\App\Form\Control\Selectize::register(?, ?);', ['addSelectize', $config]);
49: }

Nette\PhpGenerator class has changed a lot and doesn't have any $methods property anymore, so this doesn't work.
Is it possible to fix this, or is there any workaround (like manual register of component in Bootstrap class)?