archlinux
korganizer 5.4.1
(this is also affect kontact software)

create file "calendar.vcs":

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BEGIN:VCALENDAR
PRODID:-//K Desktop Environment//NONSGML KOrganizer 5.4.1//EN
VERSION:1.0
BEGIN:VTODO
DUE:20161129T134500Z
DCREATED:20161129T104116Z
UID:3321738d-e304-4f65-b414-60c4a14d0c4e
SEQUENCE:2
LAST-MODIFIED:20170125T045703Z
SUMMARY;ENCODING=QUOTED-PRINTABLE;CHARSET=utf-8:=D1=8F=D0=BA=D0=BE=D0=B3=D0=BE =D0=BB=D0=B8=D1=81=D0=BE=D0=B3=D0=BE =D1=86==0D=0A=
=D1=8F =D1=84=D1=96=D0=B3=D0=BD=D1=8F =D0=BD=D0=B5 =D0=BF=D1=80=D0=B0=D1=86==0D=0A=
=D1=8E=D1=94
STATUS:NEEDS ACTION
PRIORITY:0
CLASS:PUBLIC
END:VTODO
END:VCALENDAR

korganizer -> File -> Import -> Import from calendar
open this file
korganizer -> View -> Todo list

My todo list is empty

Edit that file with kate, do replace (regex)

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==0D=0A=\n

replace with nothing (leave field empty)
file now look like this

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BEGIN:VCALENDAR
PRODID:-//K Desktop Environment//NONSGML KOrganizer 5.4.1//EN
VERSION:1.0
BEGIN:VTODO
DUE:20161129T134500Z
DCREATED:20161129T104116Z
UID:3321738d-e304-4f65-b414-60c4a14d0c4e
SEQUENCE:2
LAST-MODIFIED:20170125T045703Z
SUMMARY;ENCODING=QUOTED-PRINTABLE;CHARSET=utf-8:=D1=8F=D0=BA=D0=BE=D0=B3=D0=BE =D0=BB=D0=B8=D1=81=D0=BE=D0=B3=D0=BE =D1=86=D1=8F =D1=84=D1=96=D0=B3=D0=BD=D1=8F =D0=BD=D0=B5 =D0=BF=D1=80=D0=B0=D1=86=D1=8E=D1=94
STATUS:NEEDS ACTION
PRIORITY:0
CLASS:PUBLIC
END:VTODO
END:VCALENDAR

save file in kate, then try import again in korganizer
for me its imported fine, single item appear in todo list
file get converted from QUOTED-PRINTABLE utf-8 to human readable utf-8

try export that calendar
korganizer -> File -> Export -> Export as vcalendar

delete calndar

try import that file, for me it empty again, and again has ==0D=0A=\n inside

note, this not only prevent to read single item, but whole file, quite disturbing to find that you can't import your tasks from backup