I just got some Hue Essential GU10 bulbs which I connected via Thread to Homey and when I increase the brightness the lights get colder. I can even change it manually to some warmer color temperature but as soon as I start changing the brightness it will shift again.
When I connect the same bulb via bluetooth to my phone (with the Hue app) the brightness control works as expected.
I assume that it might be some weird way how Homey sends the brightness command? I don’t have another Matter/Thread hub to test this out, but maybe somebody else is also running into this problem?
EDIT: I just tried to change the brightness via Homey and I see in the Hue app that the actual configured temperature starts to jump around. So I assume this is really due to how Homey sends the brightness command. @Doekse do you maybe have some insight into that?
EDIT2: When I share the matter device and then add it to Apple Home (just on my phone without a hub) the brightness controls also work as expected without shifting color temperature.
EDIT3: There is a option for the level control cluster in the Matter spec called “CoupleColorTempToLevel”. I assume that Homey might be using this incorrectly (or at least from my point of view unexpectedly).
EDIT4: Seems like it really was changed sometime between 12.5 and 12.7 to be coupled to the color temperature, which seems like a mistake
