Empty body description received by attendees Outlook 360

Your environment

TbSync version: 2.16.2 EAS-4-TbSync version: 1.18 Thunderbird version: 78.2

[X] Yes, I have installed the latest available beta version from https://tbsync.jobisoft.de and my issue is not yet fixed, I can still reproduce it.

Expected behavior

When I send an invitation to an attendance list with a description. They receive the invitation and can read the description.

Actual behavior

I create an event, with attendee list and an event description. Attendees receive the event, time is oka, but there is no description. If you open the .ics file the description is in correctly there, under the tag: DESCRIPTION.

But their client (different clients, outlook web, mac os..) is not filling the description

And this is the .ics attached:

BEGIN:VCALENDAR
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
METHOD:REQUEST
BEGIN:VTIMEZONE
TZID:Europe/Madrid
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:19700329T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:19701025T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CREATED:20200928T150155Z
LAST-MODIFIED:20200928T150206Z
DTSTAMP:20200928T150206Z
UID:412368c5-151a-49a4-bbc7-1aecda3d56e1
SUMMARY:test
ORGANIZER;ROLE=REQ-PARTICIPANT:mailto:jose.gato@atos.net
ATTENDEE;RSVP=TRUE;CN="Person, Person;PARTSTAT=NEEDS-ACTION;RO
 LE=REQ-PARTICIPANT:mailto:ignacio.elicegui@atos.net
DTSTART;TZID=Europe/Madrid:20200929T180000
DTEND;TZID=Europe/Madrid:20200929T190000
TRANSP:OPAQUE
DESCRIPTION:test
END:VEVENT
END:VCALENDAR

Steps to reproduce

...

jobisoft / EAS-4-TbSync