ceiling LED light sunset scene issue


Dear all,
when I select sunset scene in mobile app for my Yeelight Ceiling LED light, it gradually diimms for 15 minutes as supposed to but afterwards it automatically goes back to original intensity in a second. This makes no sense, I thought it should turn off completly. I have not found any topic regarding this issue, light reset did not help. Has it been reported? Is there a fix?
Thank you!