yep. it does break plasma. and the recovery works with editing ~/.config/plasma-org.kde.plasma.desktop-appletsrc. you can switch to another virtual terminal by pressing .If it gets stuck before you get to another vt wait until the kernel kills plasmashell.
breaks plasmashell. managed to recover through the configuration file ~ / .config / plasma-org.kde.plasma.desktop-appletsrc and removing anything that had "particle" in the name with the widgets I used.