Reply below from ST support. Somewhat disappointing if I’m honest.
Thanks for getting in touch.
I’m so sorry that you’re having issues with your Fibaro Smoke Sensors.
This is a known issue and our engineers are looking into it. A problem ticket has been raised for the problem.
Unfortunately, at the moment I can’t offer an ETA on when the issue will be resolved.
I offer my apologies for any inconvenience this has caused and I ask for your continued patience with the matter. smiley
If you have any more questions, please do get back in contact.