Hey Sean 👋 Thank you for bringing this to our attention.
Indeed, you should be able to downgrade to bunq Free without closing the Joint Savings Account. This is a confirmed bug, and our developers are working hard to squash it 🐛
In the meantime, please contact our support team via the in-app Support Center or at support@bunq.com 📩 One of our guides will be happy to help you switch your plan!