I'm running KDE neon 5.7 and kate doesn't show the icon on the task manager, but in the pager it's showing ok.
I already reinstalled kate with:
sudo apt-get purge kate
sudo apt-get install kate
But it doesn't fix the missing icon problem.
As you can see in the image the icon would be in the left of where Untitled - Kate is located on the task manager.
In the pager the icon is showing ok on desktop 1.
