Incredible. I have never even heard of a Kirigami, and here I only thought I had to worry about if applications were Qt (which version) or GTK (also which version) and running under Xorg or Wayland. What the hell is a Kirigami. Well, thanks for the heads up. Such are the joys of being a Linux user!
Update: I checked last night and I already had the plasma-integration package installed this whole time. I’m stumped.