Problems posting notifications from bash script started from cron (KDE)

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I am using Kubuntu 20.04 Focal (KDE Plasma v5.18.5, KDE Frameworks v5.68.0, Qt v5.12.8) and I have a bunch of Bash scripts that are expected to post some notifications, to the user and this is the step I am currently having unresolved issues with. To post notifications I am using notify-send (from libnotify-bin package) and kdialog (from kdialog package). The minimal, complete and verifiable example for my case can look like this (say, it’s /tmp/, executable file):

notify-send “notify-send test”
kdialog –passivepopup ‘kdialog test’ 5

When you run this script manually, it works just fine and produces what you expect – shows the notification that appears on your destkop (in my case in bottom-left corner of the screen):

However when I try to run my scripts from a cron job, with crontab entry like this:
* * * * * DISPLAY=:0 /tmp/

notify-send fails completely (shows nothing) and kdialog shows something oddly themed and in top-left part of the screen (I do have vertical panel on my left edge of the screen):

The cron job is running on behalf of my user and I am logged during the tests. When checking syslog I see:
Sep 10 20:05:01 HOST CRON[159928]: (USER) CMD (DISPLAY=:0 /tmp/
Sep 10 20:05:15 HOST org.freedesktop.Notifications[159641]: org.kde.knotifications: WaitForName: Service was not registered within timeout
Sep 10 20:05:15 HOST dbus-daemon[76746]: [session uid=1000 pid=76744] Activated service ‘org.freedesktop.Notifications’ failed: Process org.freedesktop.Notifications exited with status 1
Sep 10 20:05:15 HOST dbus-daemon[76746]: [session uid=1000 pid=76744] Activating service name=’org.freedesktop.Notifications’ requested by ‘:1.497’ (uid=1000 pid=159930 comm=”notify-send notify-send test ” label=”unconfined”)

I was searching for org.kde.knotifications: WaitForName: Service was not registered within timeout but failed to find any explanation what this is really caused by. I suspect that cron job environment is missing something (i.e. say env var?) that is otherwise present when launched from interactive shell, but I somehow stuck and not sure what to check next. So, ancient, posts suggested turning off panel auto-hide (I am no using auto-hide feature) or ensuring I did not mute notifications in tray (not my case either). I definitely lacks some knowledge here, so my question is – what is really preventing notification from showing up as expected? I understand that running cron job is not an equivalet of user’s manual launch, yet I failed to figure out what is really the vital difference here that I should artifically provide. What shall I peek next in my finding culprit quest? I am simply out of ideas at the moment, and nothing I found during my search crusate pushed mu any step forward right now. I’d really apreciate any hints or thoughts about that.

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