Install this version:
emerge -a =sec-policy/selinux-kwin-2.20210203# Copyright 2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI="7"
IUSE=""
MODS="kwin"
BASEPOL="2.20210203-r1"
POLICY_FILES="kwin.fc kwin.if kwin.te"
inherit selinux-policy-2
DESCRIPTION="SELinux policy for kwin"
if [[ ${PV} != 9999* ]] ; then
KEYWORDS="amd64 ~arm ~arm64 ~mips x86"
fi
DEPEND="${DEPEND}
sec-policy/selinux-xserver
"
RDEPEND="${RDEPEND}
sec-policy/selinux-xserver
"