I tried to build 2 light groups with the following code in the groups.yaml:
# Lichtgruppen
light:
- platform: group
name: Schlafzimmerlampe
entities:
- light.color_temperature_light_7
- light.color_temperature_light_8
- light.color_temperature_light_6
name: Wohnzimmerlampe
entities:
- light.color_temperature_light_12
- light.color_temperature_light_13
The second group is displayed in HA and works. But not the first.