How can I fix the LibreOffice icons not appearing in the KDE Plasma 5 Task Manager in the main panel?
LibreOffice Version: 18.104.22.168;
Build ID: 2b840030fec2aae0fd2658d8d4f9548af4e3518d
KDE Plasma: 5.15.3
Workspace Theme: Oxygen
Application WIdget Style: qtcurve
Window Decorations: OS X
Icon Set: Oxygen
No LibreOffice icons appear in the Task Manager on the default panel. Rather, a generic X-application icon represents the running component (such as Writer, Calc, Impress, etc.).
When a component of LibreOffice is starting up, the icon for that component appears for a ½ second or so, but then it is replaced with the generic X-application icon