plasmashell 5.12.5.
KDE Frameworks: 5.45.0
Qt: 5.9.4
Following entries in the systemd Journal on boot:

 # journalctl --this-boot | grep -Ei 'Warning: all files used by|deprecated'
Aug 01 08:45:32 xxx plasmashell[2756]: Warning: all files used by qml by the
plasmoid should be in ui/. The file in the path
"file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/code/LayoutManager.js"
was expected at
QUrl("file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/LayoutManager.js")
Aug 01 08:45:32 xxx plasmashell[2756]: Warning: all files used by qml by the
plasmoid should be in ui/. The file in the path
"file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/code/FolderTools.js"
was expected at
QUrl("file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/FolderTools.js")
Aug 01 08:45:36 xxx plasmashell[2756]: Connecting to deprecated signal
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Aug 01 08:45:38 xxx plasmashell[2756]: Warning: all files used by qml by the
plasmoid should be in ui/. The file in the path
"file:///usr/share/plasma/plasmoids/org.kde.panel/contents/code/LayoutManager.js"
was expected at
QUrl("file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/LayoutManager.js")
Aug 01 08:45:43 xxx plasmashell[2756]: Warning: all files used by qml by the
plasmoid should be in ui/. The file in the path
"file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/code/uiproperties.js"
was expected at
QUrl("file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/uiproperties.js")
 #