The Xiaomi Home Assistant is a powerful tool designed to integrate and control various smart devices within a home. However, like any complex system, it can occasionally encounter issues that hinder its performance. One such problem involves the yeelink.bhf_light.v6 device, where a newly generated air conditioner entity lacks the '换气' (air exchange) functionality that was previously available as a select option. This article aims to delve into the specifics of this issue, guide users through the steps to reproduce the problem, outline the expected behavior, and discuss potential solutions based on the provided system logs and version information.