Very similar to Bug 423625. Basically people disable this icon not realizing that it'll shut down all the notification handling--because we don't tell them. See an example of this at Bug 483643. We could add some text that tells people what will happen when they do this, but I think it would be better to not let it happen in the first place, by de-coupling notification handling from the widget.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/6044
Git commit bd3d80b5ec4abab346e4e4a8d045acef79bfb2d3 by Nate Graham. Committed on 02/12/2025 at 15:52. Pushed by ngraham into branch 'master'. applets/systemtray: warn when disabling the Notifications widget It's not obvious that disabling this widget will actually stop notifications from being received and displayed. So, let's tell people! This is what we do for the Clipboard widget already. M +9 -0 applets/systemtray/package/contents/ui/ConfigGeneral.qml https://invent.kde.org/plasma/plasma-workspace/-/commit/bd3d80b5ec4abab346e4e4a8d045acef79bfb2d3