D-BUS is messaging me

I’m running on fresh Silverblue machine (Version: 34.20210518.0) with KDE desktop. After checking for updates via Discover Utility (Version 5.21.5) I get the following message:
Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

No issue with my firewall setting and D-BUS is active:

$ /bin/systemctl status dbus.service
● dbus-broker.service - D-Bus System Message Bus
Loaded: loaded (/usr/lib/systemd/system/dbus-broker.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2021-05-19 08:26:20 CEST; 2h 4min ago
TriggeredBy: ● dbus.socket

Nevertheless, it was possible to pull the updates. So probably not a real issue here.
I’m not sure what the root cause can be. Has anyone a recommendation?

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