Hera: wingpanel-indicator-session freezes for a long time the first time I click on it

After I login to my elementary Hera install, I’m able to do most tasks normally, including using indicator panels on wingpanel. However, as soon as I try to click on the session indicator to logout/reboot, wingpanel freezes.

Everything else works fine, but I can’t use wingpanel at all (searching for applications, using other applets – nothing works).

After several minutes, wingpanel is responsive again, and this time, the session indicator is also usable. This is good till the next time I login.

This is what I see in /var/log/syslog around the time I try to use the session indicator for the first time:

Jul 11 23:43:23 elemental PackageKit: daemon start
Jul 11 23:43:23 elemental dbus-daemon[902]: [system] Successfully activated service 'org.freedesktop.PackageKit'
Jul 11 23:43:23 elemental systemd[1]: Started PackageKit Daemon.
Jul 11 23:43:25 elemental io.elementary.a[3271]: ComponentValidator.vala:37: Using .blacklist files is deprecated and will be removed in next version, please use .hiddenapps instead
Jul 11 23:43:26 elemental PackageKit: get-packages transaction /258_eccabcba from uid 1000 finished with success after 962ms
Jul 11 23:43:27 elemental PackageKit: search-name transaction /259_dcecabcb from uid 1000 finished with success after 536ms
Jul 11 23:43:27 elemental PackageKit: get-details transaction /260_ebacebeb from uid 1000 finished with success after 479ms
Jul 11 23:43:28 elemental PackageKit: get-updates transaction /261_acbbaaaa from uid 1000 finished with success after 660ms
Jul 11 23:43:29 elemental systemd-resolved[746]: Using degraded feature set (UDP) for DNS server 192.168.86.1.
Jul 11 23:44:30 elemental plank.desktop[2176]: QApplication: invalid style override passed, ignoring it.
Jul 11 23:44:30 elemental plank.desktop[2176]:     Available styles: Windows, Fusion
Jul 11 23:44:30 elemental plank.desktop[2176]: Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Jul 11 23:44:31 elemental plank.desktop[2176]: qrc:/QML/DebugMenu.qml:262: TypeError: Cannot call method 'isWasabiEnabled' of undefined
Jul 11 23:44:31 elemental plank.desktop[2176]: qrc:/QML/DebugMenu.qml:289: TypeError: Cannot call method 'isSearchInCommunitiesForceEnabled' of undefined
Jul 11 23:44:31 elemental plank.desktop[2176]: qrc:/QML/DebugMenu.qml:296: TypeError: Cannot call method 'isOOABURISpamCheckerForceEnabled' of undefined
Jul 11 23:44:31 elemental plank.desktop[2176]: qrc:/QML/DebugMenu.qml:304: TypeError: Cannot call method 'isRateCallQualityForceEnabled' of undefined
Jul 11 23:44:42 elemental wingpanel[2174]: session_widgets_userbox_update_state: assertion 'self != NULL' failed
Jul 11 23:44:51 elemental wingpanel[2174]: message repeated 2 times: [ session_widgets_userbox_update_state: assertion 'self != NULL' failed]
Jul 11 23:45:22 elemental rtkit-daemon[1337]: Supervising 4 threads of 2 processes of 1 users.
Jul 11 23:45:59 elemental rtkit-daemon[1337]: message repeated 5 times: [ Supervising 4 threads of 2 processes of 1 users.]

I’ll be happy to provide any more information – I tried uninstalling/re-installing various wingpanel indicators while investigating this, to no avail, before I finally narrowed it down to the session indicator. Killing wingpanel and manually launching it again didn’t help much either. Thanks!