SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. Install plasma-bigscreen from Neon repos:
sudo pkcon install plasma-bigscreen
2. Run plasma-bigscreen test from current session:
QT_QPA_PLATFORM=wayland dbus-run-session kwin_wayland "plasmashell -p org.kde.plasma.mycroft.bigscreen"


OBSERVED RESULT:
Terminal output:
"dbus-daemon[3292]: [session uid=999 pid=3292] Successfully activated service 'org.freedesktop.portal.Desktop'
KPackageStructure of KPluginMetaData(pluginId:"org.kde.mycroft.bigscreen.homescreen", fileName: "/usr/share/plasma/plasmoids/org.kde.mycroft.bigscreen.homescreen/metadata.json") does not match requested format "Plasma/Applet"
kde.plasmashell: Aborting shell load: The activity manager daemon (kactivitymanagerd) is not running.
kde.plasmashell: If this Plasma has been installed into a custom prefix, verify that its D-Bus services dir is known to the system for the daemon to be activatable.
kf.windowsystem: virtual void KX11Extras::connectNotify(const QMetaMethod&) may only be used on X11
kf.windowsystem: virtual void KX11Extras::connectNotify(const QMetaMethod&) may only be used on X11
dbus-daemon[3292]: [session uid=999 pid=3292] Successfully activated service 'org.kde.ActivityManager'
kde.plasmashell: Aborting shell load: The activity manager daemon (kactivitymanagerd) is not running.
kde.plasmashell: If this Plasma has been installed into a custom prefix, verify that its D-Bus services dir is known to the system for the daemon to be activatable."

***Only the desktop background and date/time widget (?) show.


EXPECTED RESULT:
Full Plasma Bigscreen home screen and associated functionality.


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Yes
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0 
Qt Version: 6.6.2
Kernel version: 6.5.0-21-generic (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Does not work in full Bigscreen session either (only get a blank screen then and no background + date/time visible). X11 instead of Wayland also does not work either in windowed or full session, generates slightly different errors.