Yeelight 650 not accesible in Mi Home app

Hi. I have a smart home system with 2 standard yeelight ceiling lights, one yeelight 480 ceiling light, one yeelight 650 ceiling light, one yeelight color bulb, a yeelight ledstrip, a mijia gateway and some sensors.
All work fine together except for 1 thing. The Yeelight 650 is not accessible in the Mi home app. It stays on some kind of loading screen. Already resetted the light a couple times and reconnected it again, nothing works. The weird thing is that the light works fine in the Yeelight app. But now I cannot use it properly in my automations in the Mi Home app in combination with the sensors. Very frustrating.I’m on the Chinese server. Hope somebody can help.