New light bulb does not show up in the overview but as a device

I added a new zigbee light bulb in home assistant via an external mqtt broker. I can see the details, I can switch it under setup/devices and via home kit. But I cannot see/switch it from the main page (overview). Any idea how to change this behaviour? Thank you.

Does the light exist in Developer Tools / States ?

Yes, it does. I fixed it myself by adding it manually to the main page. For some reason it did now work automatically. Thank you.