@sdetweil Ok, that’s true for a single event.
If I modify the event to a series event. Then the calendar module shows a wrong end date.
In the ical file, the content is different.
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221121T133000
DTEND;TZID=Europe/Berlin:20221121T133000
RRULE:FREQ=WEEKLY;BYDAY=MO
DTSTAMP:20221120T133538Z
UID:4anfmr8fbcgce4qsi1675tpgcq@google.com
CREATED:20221120T074454Z
DESCRIPTION:
LAST-MODIFIED:20221120T133406Z
LOCATION:
SEQUENCE:1
STATUS:CONFIRMED
SUMMARY:XYZ-series
TRANSP:OPAQUE
END:VEVENT
I indented the lines to read the values better
DTSTART;TZID=Europe/Berlin:20221121T133000
DTEND;TZID=Europe/Berlin:20221121T133000