By default, XWayland apps are now allowed to listen for non-alphanumeric keypresses, and shortcuts using modifier keys. This lets any global shortcut features they may have work with no user intervention required, while still not allowing arbitrary listening for alphanumeric keypresses which could potentially be used maliciously
This is… very smart actually. Any reason this is limited to Xwayland? (Is that XDG portal a thing yet?)
X apps can read all of your keystrokes. Wayland by default doesn’t allow this, and because of that apps running on XWayland can ex. have it’s global shortcuts broken. Plasma already had an option to change this behaviour back in 5.27. I guess they changed it from “Never” read keystrokes to “Only with modifier keys”, as a default.