That’s fine. Check here: Plasma 6 Update some hints
Pay attention to points 1 and 4.
- You would need to log out — not reboot.
- After you do so, select the X11 session from the login manager, and log back in.
- Then test Discord again.
- If there are no issues, it just means that there is an issue with Discord’s compatibility with Wayland.
X11 and Wayland pretty much determine how your desktop, apps, etc. interact with your display/screen.