cAdvisor cannot query its own cgroup

[agross]

Apr 13 21:27:22 nest cadvisor[3156300]: W0413 21:27:22.505812 3156300 container.go:606] Failed to update stats for container "/system.slice/cadvisor.service": error while statting cgroup v2: [openat2 /sys/fs/cgroup/system.slice/cadvisor.service/memory.pressure: invalid cross-device link], continuing to push stats

If I set ProtectControlGroups=false, the warning goes away, and cAdvisor starts reporting its own CPU usage.

$ systemctl --version
systemd 257 (257.9-1~deb13u1)
+PAM +AUDIT +SELINUX +APPARMOR +IMA +IPE +SMACK +SECCOMP +GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP +LIBCRYPTSETUP_PLUGINS +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +TPM2 +BZIP2 +LZ4 +XZ +ZLIB +ZSTD +BPF_FRAMEWORK +BTF -XKBCOMMON -UTMP +SYSVINIT +LIBARCHIVE