I mean, in Wayland mode, it crashes when you, for example, rotate a mesh. It also, as you move a mesh the slightest bit, will suddenly lurch the mesh off the screen. You're still attached to it. You can drag it back with the mouse like you're reeling in a trout. When you try to minimize a screen, it won't do it. You have to drag the screen somewhere else. Then it usually will. If it won't, drag it again.
I'm going back to X11 mode, where it still crashes, but with less stupidity along the way.
Unreal consistently gives Linux developers the middle finger.