Still an issue in 1.18 Release Candidate 1. This bug triggers extremely often and is a serious hindrance to playing the game.
The issue is still not resolved, nor is it a feature request. Wayland support is necessary to ensure the game runs properly upon Linux as Wayland gains more and more adoption going further.
On Arch Linux (meaning the system software is very up to date) using with with a Nvidia 1660 Ti with the 470 driver, launching the game would be met with severe graphical glitches that blocked out much of the game window, making the game unplayable.
On Pop!_OS 21.04 (meaning the system software is somewhat up to date) with the Nvidia 1660 Ti and 470 driver, the game would launch but would be running using generic mesa drivers instead of the actual system drivers, leading to very poor performance (this issue is not present if using Xorg, the system would default to the correct, much faster Nvidia drivers).
I'm no longer using Kubuntu, so I can't confirm if that issue still exists.
I just tested 22w16a and the issue has been fixed.