Ok. Then maybe it is a general issue with Matter buttons. I cannot test that because I have no other button devices using Matter.
But one thing we can agree on, restarting the Ikea app should not cause this issue. It is for Athom to find out were it goes wrong. 
My findings with the Bilresa dual button after some frustrating testing with Matter over Thread.
I had some problem adding the switch to Homey. The method that worked best, was to add the Bilresa button to Apple home since I’m using Apple tv as my TBR.
From there, I could share the button to Homey.
The button works very well with Apple home, I could configure the button to switch on a Kajplats light bulb with one click on the button, and switch off the bulb with a double click or a long press.
Trying to make a similar flow with Homey did not work.
It seems that Homey does not distinguish the click pattern, there seems to be no difference from one click and long pressure.
Not sure why, but for the Ikea app for Homey, the only flow for the Bilresa button is to check for changes in the battery level, maybe the flows for the buttons is not yet added?
I also have a Dirigera for testing, but I guess I will return it since I can’t see any benefits using this in my setup.
True, but they’ll need to be notified the preferred way, like they’ve mentioned on the app page at the homey.app store (which is: contact support).
Officially this is a users only forum 
A post was merged into an existing topic: IKEA BILRESA not working after Restart of IKEA Smart Homey App
Same problem, I‘ve opened a Ticket.
It’s been almost a month since every IKEA device stopped working after I upgraded to HP26. I filed a case with Athom and they replied dec 31 with the issue being known but no timeline to fix.
The more cases they get, the more it needs to be prioritized. So please everyone having the issue, file a case with athom.
Click Contact under support at the bottom of the app page: IKEA Home Smart | Homey
