Attendee - Lightning not adhering to RFC standard?

Thunderbird 52.4.0
Lightning 5.4.4

When adding "attendees" (also known as participants) to an event, in the ICS it looks like this:
ATTENDEE;RSVP=TRUE;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICIPANT:Mister Bean

However, iCalender RFC 2445 states:
"The property parameter CN is for the common or displayable name associated with the calendar address"

Therefore it should look like this:
ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;CN=Mister Bean

Also: I can not change the status (partstat) manually using the GUI of Lightning.