Interesting. My device behaved as in "actual case" as well, just now.

Although I could reproduce the "buggy case". Looks like, the "buggy case" I mentioned happens only after the bug you reported is executed at least once. Open browser in foreground, double press lock button and then unlock and swipe left and instead of events view browser opens (the actual reported bug). Now if you try the "buggy case" I mentioned, it behaves just as mentioned.