Since Plasma 5.5, the icons in the task manager are hard to click ; sometimes, clicking a launcher won't do anything. It did not happen in previous versions of Plasma. Someone said it happened in Icon-only task manager too. But I use the default one and it happens too.
Steps to Reproduce:
1. Click a launcher in Task Manager in a Plasma panel
Sometimes nothing happens
It should always launch the application I clicked, like it did before
*** This bug has been marked as a duplicate of bug 356415 ***