In colibri, notifications from KDE workspace appear as "KDE workspace" without specifying the root cause. This was tested with the empty trash notification. Reproducible: Always
Sorry for the noise, this is not related to Colibri but to the notifications from the KDE workspace, as the same thing happens when using KDE native notifications instead of Colibri
Reassigning to Plasma then.
*** This bug has been marked as a duplicate of bug 319384 ***