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I'd imagine XWayland Xorg emulation is far from perfect so I wouldn't be surprised if games that depend on that would crash.

That being said, I recently switched to Wayland again after a hiatus and it seems support keeps improving. I'm not using proprietary NVIDIA drivers currently so that might be it.

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The thing that you have to remember about Xwayland is that it is Xorg. It just has a Wayland DDX[0] on the back end rather than a device-specific DDX or one that talks e.g., directly to the modesetting driver.

[0] Device-Dependent X, i.e., the bits of X that talk directly to the display. Contrasted with Device-Independent X (DIX), i.e., the bits that do state tracking and protocol communication with clients.

So, it is the Wayland DDX part that is buggy? How is that different from "Wayland Xorg emulation is buggy"?

Because it can't emulate what it actually is. Xwayland is Xorg.

Xwayland is maintained by Xorg

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