OK, I have asked Athom how long we will have to wait. Here is the answer :
Thank you for reaching out to our support.
Unfortunately the issue is not caused by Athom, otherwise we would be able to fix the issue rapidly.
This issue is caused by Aqara, they’re basically blocking all non-Aqara Zigbee controllers at the moment with their new firmware. We’ve been reaching out to Aqara for a long time and we finally received some answers. They acknowledge the fact that their new firmware on their devices is causing issues (not just for Athom, but all other Zigbee controllers as well).
We will now try to figure out if we can develop a work-around for this issue, if this is even possible. Please keep a keen eye on the Homey Pro Changelog to see if a fix is deployed in the firmware updates: