VCard does not handle multi line entries

[tuxmac]

The vcard api produces cards like these
BEGIN:VCARD
VERSION:3.0
PRODID:-//Kopano//libicalmapi 8.7.25//EN
N:;X U.
FN:X U.
ORG:Dr. X
TEL;TYPE=WORK:(0511) xxx xxx
ADR;TYPE=WORK:;;Sutelstr. xxx
30659 Hannover
UID:040000008200E00074C5B7101A82E0080000000080C5729AF2E9D801000000000000000001000000D0FA8F9481F447F7BB93FF61B3A0B9BE
NOTE:
REV:2022-10-27T10:55:19Z
END:VCARD

The linebreak for ADR;TYPE is wrong. Because the new line with 30659 is treated as a new vcard entry and causes an error, because it is unknown.
Same happens e.g. for NOTE where multi line entries maybe more common in germany.

The current solutions result not being able to sync contacts as long there is any contact with a multi line entry. The adresesses were actually broken because all of them were german and in Kopano everything was placed in the street field. That could be fixed by fixing the data. Contacts with notes could be fixed by deleting the note or remove line breaks. That is not a good solution.
There might be a use case for linebreaks in the street field in the future. Especially with non german adresses.

I found how multi line entries should be handled here mangstadt/ez-vcard#3