So far I was able to control brightness and color of those lights together, however since the update more lights seem to be unavaiable (mostly IKEA lights) and for no light or group I can switch brightness or colors.
No, everything unchanged. Sadly no clue from where I upgraded, but definitely 2-3 months without an update. When the new Home Assistant started the discovery component asked me to configure Hue, which I clicked. Maybe that was the problem. Since then I added hue to the ignore list of the discovery component, deleted als configuration files of hue, and added it again via pressing the bridge button. No change…
Converted all my groups to light groups and now it works again. Still weird that the brightness selector is removed when adding lights to normal groups…