Error building the firmware image Server response: Error: Impossible package selection

{
    "url": "https://sysupgrade.openwrt.org",
    "revision": "r21861-5dee596501",
    "advanced_mode": "0",
    "branch": "SNAPSHOT",
    "efi": null,
    "profile": "linksys,e8450-ubi",
    "target": "mediatek/mt7622",
    "version": "SNAPSHOT",
    "packages": [
        "adblock",
        "auc",
        "base-files",
        "blockd",
        "busybox",
        "ca-bundle",
        "dnsmasq",
        "dropbear",
        "firewall4",
        "fstools",
        "kernel",
        "kmod-fs-exfat",
        "kmod-fs-ext4",
        "kmod-fs-f2fs",
        "kmod-fs-vfat",
        "kmod-gpio-button-hotplug",
        "kmod-ipt-offload",
        "kmod-leds-gpio",
        "kmod-mt7615-firmware",
        "kmod-mt7615e",
        "kmod-mt7915e",
        "kmod-nls-base",
        "kmod-nls-cp437",
        "kmod-nls-iso8859-1",
        "kmod-nls-utf8",
        "kmod-usb-storage",
        "kmod-usb-storage-uas",
        "kmod-usb3",
        "libc",
        "libustream-openssl",
        "logd",
        "luci",
        "luci-app-adblock",
        "luci-app-attendedsysupgrade",
        "luci-mod-rpc",
        "luci-ssl-openssl",
        "luci-theme-openwrt-2020",
        "mtd",
        "netifd",
        "odhcp6c",
        "odhcpd-ipv6only",
        "opkg",
        "ppp",
        "ppp-mod-pppoe",
        "procd",
        "procd-seccomp",
        "procd-ujail",
        "tcpdump",
        "uboot-envtools",
        "uci",
        "uclient-fetch",
        "urandom-seed",
        "urngd",
        "wpad-openssl"
    ],
    "diff_packages": true,
    "filesystem": "squashfs",
    "client": "luci/git-22.285.67526-18bfcca"
}

STDERR

Package list missing or not up-to-date, generating it.

Building package index...
Downloading https://downloads.openwrt.org/snapshots/targets/mediatek/mt7622/packages/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_core
Downloading https://downloads.openwrt.org/snapshots/targets/mediatek/mt7622/packages/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/base/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_base
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/base/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/targets/mediatek/mt7622/kmods/5.15.90-1-1796c7c608ded2a1d723367e44a948fb/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_kmods
Downloading https://downloads.openwrt.org/snapshots/targets/mediatek/mt7622/kmods/5.15.90-1-1796c7c608ded2a1d723367e44a948fb/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/luci/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_luci
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/luci/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/packages/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_packages
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/packages/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/routing/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_routing
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/routing/Packages.sig
Signature check passed.
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/telephony/Packages.gz
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/openwrt_telephony
Downloading https://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a53/telephony/Packages.sig
Signature check passed.
Downloading file:packages/Packages
Updated list of available packages in /home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/build_dir/target-aarch64_cortex-a53_musl/root-mediatek/../../../../../../../../../../../home/aparcar/asu/worker1/cache/SNAPSHOT/mediatek/mt7622/dl/imagebuilder
Downloading file:packages/Packages.sig
Signature check failed.
Remove wrong Signature file.
Collected errors:
 * pkg_hash_check_unresolved: cannot find dependency libubus20220615 for blockd
 * pkg_hash_fetch_best_installation_candidate: Packages for blockd found, but incompatible with the architectures configured
 * opkg_install_cmd: Cannot install package blockd.
make[2]: *** [Makefile:185: package_install] Error 255
make[1]: *** [Makefile:150: _call_manifest] Error 2
make: *** [Makefile:269: manifest] Error 2

Start with the requested profile, target, and package list, then inspect the imagebuilder package-index and signature output around Makefile lines 185, 150, and 269. Reproduce the build and trace why blockd cannot resolve libubus20220615; done means the firmware image builds successfully with the requested packages.