The problem is still present in the final version 115.0.1 I started having it since upgrading to v115. I need an indicator in the tray with the amount of messages I get. Disabling it is not a fix. Is there any solution to this problem, e.g. in advanced settings?
I had the same issue and tried to change the setting "Automatically mark messages as read". I set "After displaying for 5 sec" (instead of immediately on display) and now seems to work well. Give it a try.