Hey Kozimierz
Unfortunately, it's happening to many of us who are still running 2.26 and not allowed to update yet. I found a workaround:
1. Open the browser you want to automate
2. Deactivate the browser extension
3. Activate the browser extension
4. Refresh in the browser
5. You need to keep this browser window open to run the flows (yeah it sucks, but it works)
Have a great day, Anders