Plasma here.
Everything seems fine except when I open Dolphin (directly or from application), which I use in dual-pane mode.
The first folder is selected, surrounded by blue, and I can't right-click directly on it, no menu. I have to navigate a little and then go back for the right-click to work properly. It's the same for files. There are apparently new options in the right-click menu, such as folder color, etc.
I tried with X11 and Wayland, with the same result, although I'm currently using X11, which I find more efficient these days.

Example: taking a screenshot with Spectacle, opening the output folder from Spectacle, I can't right clic directly on the file to rename it.
If I remember correctly, there was no folder automatically selected by opening Dolphin
Update: If I open a folder with a right clic from Dolphin icon task bar, same problem.