This is the feedback from homey:
For several years, window coverings (roller shutters, blinds, etc.) used a dim-level capability, which was technically incorrect, as dim-level should only be used for lights of any kind. We introduced the window coverings capability, which has some unique properties, and allowed us to further improve our software.
Unfortunately in your case this means that previously added devices still have the dim-level capability (as the capabilities are set during pairing, and cannot be changed without a re-pair), and the newly added devices have a window covering capability, due to the new settings.
If you want to control all devices with a single group, you’ll have to remove the older devices, and re-pair them to Homey, so the window covering capability is used. Alternatively, you can create 2 groups, and use a flowcard for each respective group in the flows you want to create.
That’s incredible! changing things without regard to the users nor offering an intermediate solution is not OK at all!!! I can’t believe that such a serious change is simply made according to “sink or swim”.
For me it shows that the maturity level of this sw product still low and unstable!
Now I can spend again a toned of hours to re-pair all the devices to be able to group them like before! otherwise, I can go away from the group app and this is sad , because I like the idea behind it makes the flows clear and simple.