Error during attended upgrade

I tried to use the attended upgrade LUCI package.
It ended up in error and asked to report it, so here it goes:
Request:

{
    "url": "https://sysupgrade.openwrt.org",
    "revision": "r19590-042d558536",
    "advanced_mode": "0",
    "branch": "22.03",
    "efi": null,
    "profile": "default-string-default-string",
    "target": "x86/64",
    "version": "22.03.5",
    "packages": [
        "adblock",
        "avahi-dbus-daemon",
        "base-files",
        "bnx2-firmware",
        "busybox",
        "ca-bundle",
        "cgi-io",
        "diffutils",
        "dnsmasq",
        "dropbear",
        "e2fsprogs",
        "firewall4",
        "fstools",
        "fwtool",
        "getrandom",
        "grub2",
        "grub2-bios-setup",
        "grub2-efi",
        "htop",
        "iperf3",
        "ipset",
        "iptables-nft",
        "jansson",
        "jshn",
        "jsonfilter",
        "kernel",
        "kmod-amazon-ena",
        "kmod-amd-xgbe",
        "kmod-bnx2",
        "kmod-button-hotplug",
        "kmod-crypto-crc32c",
        "kmod-crypto-hash",
        "kmod-e1000",
        "kmod-e1000e",
        "kmod-forcedeth",
        "kmod-fs-vfat",
        "kmod-igb",
        "kmod-igc",
        "kmod-input-core",
        "kmod-ixgbe",
        "kmod-lib-crc-ccitt",
        "kmod-lib-crc32c",
        "kmod-nf-conntrack",
        "kmod-nf-conntrack6",
        "kmod-nf-flow",
        "kmod-nf-log",
        "kmod-nf-log6",
        "kmod-nf-nat",
        "kmod-nf-nat6",
        "kmod-nf-reject",
        "kmod-nf-reject6",
        "kmod-nfnetlink",
        "kmod-nft-core",
        "kmod-nft-fib",
        "kmod-nft-nat",
        "kmod-nft-nat6",
        "kmod-nft-offload",
        "kmod-nls-base",
        "kmod-nls-cp437",
        "kmod-nls-iso8859-1",
        "kmod-nls-utf8",
        "kmod-pcspkr",
        "kmod-ppp",
        "kmod-pppoe",
        "kmod-pppox",
        "kmod-r8169",
        "kmod-slhc",
        "kmod-tg3",
        "libavahi-dbus-support",
        "libblkid",
        "libblobmsg-json",
        "libcomerr",
        "libext2fs",
        "libf2fs",
        "libiwinfo",
        "libiwinfo-data",
        "libiwinfo-lua",
        "libjson-c",
        "libjson-script",
        "liblua",
        "liblucihttp",
        "liblucihttp-lua",
        "libmnl",
        "libncurses",
        "libnftnl",
        "libnl-tiny",
        "libsmartcols",
        "libss",
        "libubox",
        "libubus",
        "libubus-lua",
        "libuci",
        "libuclient",
        "libustream-wolfssl",
        "libuuid",
        "logd",
        "lua",
        "luci",
        "luci-app-adblock",
        "luci-app-attendedsysupgrade",
        "luci-app-firewall",
        "luci-app-opkg",
        "luci-app-wireguard",
        "luci-app-wol",
        "luci-base",
        "luci-i18n-adblock-en",
        "luci-i18n-attendedsysupgrade-en",
        "luci-i18n-wol-en",
        "luci-lib-base",
        "luci-lib-ip",
        "luci-lib-jsonc",
        "luci-lib-nixio",
        "luci-mod-admin-full",
        "luci-mod-network",
        "luci-mod-status",
        "luci-mod-system",
        "luci-proto-ipv6",
        "luci-proto-ppp",
        "luci-proto-wireguard",
        "luci-ssl",
        "luci-theme-bootstrap",
        "mkf2fs",
        "mtd",
        "netifd",
        "nftables-json",
        "nmap",
        "odhcp6c",
        "odhcpd-ipv6only",
        "openwrt-keyring",
        "opkg",
        "partx-utils",
        "ppp",
        "ppp-mod-pppoe",
        "procd",
        "procd-seccomp",
        "procd-ujail",
        "px5g-wolfssl",
        "qrencode",
        "r8169-firmware",
        "rpcd",
        "rpcd-mod-file",
        "rpcd-mod-iwinfo",
        "rpcd-mod-luci",
        "rpcd-mod-rrdns",
        "terminfo",
        "ubox",
        "ubus",
        "ubusd",
        "uci",
        "uclient-fetch",
        "ucode",
        "ucode-mod-fs",
        "ucode-mod-ubus",
        "ucode-mod-uci",
        "uhttpd",
        "uhttpd-mod-ubus",
        "urandom-seed",
        "urngd",
        "usign"
    ],
    "diff_packages": true,
    "filesystem": "ext4",
    "client": "luci/git-23.093.42303-58b861d"
}

STDERR:

Generate local signing keys...
Generate local certificate...
Package list missing or not up-to-date, generating it.

Building package index...
Downloading https://downloads.openwrt.org/releases/22.03.5/targets/x86/64/packages/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_core
Downloading https://downloads.openwrt.org/releases/22.03.5/targets/x86/64/packages/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/base/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_base
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/base/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/luci/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_luci
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/luci/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/packages/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_packages
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/packages/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/routing/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_routing
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/routing/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/telephony/Packages.gz
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/openwrt_telephony
Downloading https://downloads.openwrt.org/releases/22.03.5/packages/x86_64/telephony/Packages.sig
Signature check passed.
Downloading file:packages/Packages
Updated list of available packages in /builder/build_dir/target-x86_64_musl/root-x86/../../../../builder/dl/imagebuilder
Downloading file:packages/Packages.sig
Signature check passed.
Collected errors:
 * opkg_install_cmd: Cannot install package kmod-nft-nat6.
make[2]: *** [Makefile:170: package_install] Error 255
make[1]: *** [Makefile:135: _call_manifest] Error 2
make: *** [Makefile:255: manifest] Error 2

Start by reproducing the attended upgrade request for OpenWrt 22.03.5 on x86/64 and inspect the image-building step that installs the requested package list. Focus on why kmod-nft-nat6 cannot be installed; the work is done when this request completes successfully or reports a specific, actionable incompatibility.