After setting a target temperature and leaving any associated HomeKit app or refreshing status, target temperature reverts to the current temperature reported by the indoor temperature sensor
Checked offical Daikin app, while HomeKit shows the wrong target temperature, it isn't pushed to the Daikin, so once a temperature is set, it will still heat/cool to the correct temperature
After setting a target temperature and leaving any associated HomeKit app or refreshing status, target temperature reverts to the current temperature reported by the indoor temperature sensor