From README.Debian:
KillUserProcesses behavior in Debian ====================================If KillUserProcesses=yes is configured in logind.conf(5), the session scope will be terminated when the user logs out of that session. See logind.conf(5): | Note that setting KillUserProcesses=yes will break tools like screen(1) and | tmux(1), unless they are moved out of the session scope. The default for KillUserProcesses in /etc/systemd/logind.conf is set to "yes" in upstream systemd, though Debian defaults to "no" (see #825394).
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=825394
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