lxqt-panel ignores shutdown in a VT

[gregrwm]

boot up a fully updated lubuntu 20.04 system (into sddm).
press ctl-alt-F2.
login (on the VT).
startx /bin/x-terminal-emulator
move mouse into the terminal.
startlxqt&
(it comes up in a few seconds)
reboot

/sbin/reboot works well with an sddm session, and invoking reboot from the lxqt menu works well in a VT, but if i chose to login on a VT *and* if i choose to use /sbin/reboot, eg in a script, or if two sessions are open, then shutdown proceeds only part way. apparently lxqt-panel ignores the shutdown, and we're left watching a message like

[ *** ] a stop job is running for session 20 of lubuntu (15s / 1min 30s)

workaround: pkill -9 lxqt-panel

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lxqt-session 0.14.1-2ubuntu2
ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sun Oct 17 10:10:18 2021
InstallationDate: Installed on 2021-09-30 (17 days ago)
InstallationMedia: Lubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: lxqt-session
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.