Created attachment 7131 Example The issue is hard to describe, see attachment for an example. In the picture, you can see the menu that appears when left-clicking a group of windows in the taskbar. Right-clicking one of those windows and clicking "close" doesn't update said menu. Only the window count gets decremented. You have to close the menu by clicking somewhere else and open it again for it to be updated.
I'm experiencing the same behavior with Manjaro (Arch) with the latest stable version available.
This project has been archived, so we are closing related bugs.