In the following code, what is the main problem that breaks the Template Method pattern?

In the following code, what is the main problem that breaks the Template Method pattern?

class Report:
    def generate(self):
        self.load_data()
        self.process_data()
        self.save_report()

    def load_data(self):
        print('Loading data')

    def process_data(self):
        print('Processing data')

    def save_report(self):
        print('Saving report')

class CustomReport(Report):
    def generate(self):
        print('Custom generate start')
        self.load_data()
        self.process_data()
        self.save_report()
        print('Custom generate end')