Fedora-33 HOST / Fedora-33 LXC GUEST :: WARN[0000] The cgroupv2 manager is set to systemd but there is no systemd user session available

LXC
2

Answer:

Just as the following to this file, creating it if necessary:
${HOME}/.config/containers/containers.conf:

[engine]
events_logger = "file"
cgroup_manager = "cgroupfs"
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