Erro php 8.2 Trying to access array offset on value of type null on vendor/openboleto/opencnabphp/src/RegistroRetAbstract.php on line 71

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Pra corrigir, basta alterar a linha 71 de:

$metaData = (isset($this->meta[$prop])) ? $this->meta[$prop] : null;

Para:

$metaData = (isset($this->meta[$prop])) ? $this->meta[$prop] : array('tipo' => null);