Right, the file https://deconz.dresden-elektronik.de/raspbian/stable/deconz-latest.deb have problem.
Have you take a look here ( apt get install deconz-qt6) > Debain 13 und deconz - #6 by keinstein
sudo systemctl stop deconz
sudo apt remove deconz
But not sure you have installed it using package procedure.
dpkg --get-selections | grep deconz