@apollo13 Seems like the calendar app has set the event to non-all-day, but didn’t set an EVENT_TIMEZONE, which is (as far as I understand it) required for non-all-day events.
This should not happen, but I have changed the code so that it at least doesn’t in this case (but use the system default time zone instead): https://gitlab.com/bitfireAT/ical4android/commit/c89046a96e11df682c146e28fbfbd5c5ccb93a80
I’ll send you an APK with the patch to test, too.