Question about Tax Refund and Remittance in Japan

This is my first post on Reddit, and I have a question about tax refunds in Japan. I work for a Japanese company, and for the past four years, I’ve been declaring tax refunds. Usually, we only need to fill out some documents provided by the company, and the due date is around the end of October or the second week of November. However, I’ve noticed that remittances in November and December are always excluded from the tax refund process. Is this a common practice in Japan? I’d appreciate your insights and experiences regarding this matter. Thank you! 🇯🇵💰✈️