Db trans rollback but leave model primary key exists

What steps will reproduce the problem?

namespace app\commands;

use app\models\Model1;
use Yii;
use yii\base\Exception;
use yii\console\Controller;

class TestController extends Controller
{
    public function actionIndex()
    {
        $model = new Model1();
        $model->... = '...'; // fill with correct values
        try {
            Yii::$app->db->transaction(function () use (&$model) {
                $model->save();
                throw new Exception('Another error occurred.');
            });
        } catch (\Throwable $e) {
            $this->stdout($e->getMessage() . PHP_EOL);
            $this->stdout($model->id . PHP_EOL);
        }
    }
}

What is the expected result?

Empty $model->id

What do you get instead?

There is a value in $model->id

Additional info

Start by reproducing the provided Yii transaction example with the stated PHP and Yii versions, then trace the transaction and model save behavior involved in assigning the primary key. Done means the rolled-back model has an empty id, with the original reproduction still behaving correctly.