Invisible event

Here is an event that is not visible in kalendar/korganiuzer but in nextcloud calendar. I will look at this weekend but wanted to keep a trace of it:

BEGIN:VCALENDAR
PRODID:-//K Desktop Environment//NONSGML libkcal 4.3//EN
VERSION:2.0
X-KDE-ICAL-IMPLEMENTATION-VERSION:1.0
BEGIN:VTIMEZONE
TZID:Asia/Calcutta
END:VTIMEZONE
BEGIN:VEVENT
ORGANIZER:MAILTO:customer@customer.com
DTSTAMP:20220113T220831Z
ATTENDEE;RSVP=TRUE;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICIPANT;
 CUTYPE=INDIVIDUAL;X-UID=139957348022656:mailto:carl.schwan@nextcloud.com
X-MICROSOFT-CDO-ALLDAYEVENT:FALSE
X-MICROSOFT-CDO-APPT-SEQUENCE:0
X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE
X-MICROSOFT-CDO-IMPORTANCE:2
X-MICROSOFT-CDO-INSTTYPE:0
X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
X-MICROSOFT-CDO-OWNERAPPTID:2127370214
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MICROSOFT-DONOTFORWARDMEETING:FALSE
X-MICROSOFT-LOCATIONS:[ { "DisplayName" : "Mobile 
 +4900000"\, "LocationAnnotation" : ""\, "LocationSource" : 0\, "Unresolved" :
  false\, "LocationUri" : "" } ]
CREATED:20220113T220831Z
UID:
 040000008200E00074C5B7101A82E0080000000090748B26C608D801000000000000000010
 000000C6E8C2C0E89B7B46BBBD71CFC6A8A405
LAST-MODIFIED:20220113T220831Z
DESCRIPTION:Hello worl
SUMMARY:Weekly Coaching session
LOCATION:Hello world
STATUS:CONFIRMED
PRIORITY:1
DTSTART;TZID=Asia/Calcutta:20220114T133000
DTEND;TZID=Asia/Calcutta:20220114T153000
TRANSP:OPAQUE
BEGIN:VALARM
DESCRIPTION:REMINDER
ACTION:DISPLAY
TRIGGER:-PT15M
END:VALARM
END:VEVENT
END:VCALENDAR