The open gl renderer starts, but i cant play the game itself. Rendering the vulkan shaders, rebooting and using proton experimental(i use the native version) didnt worked.
If they dynamically-linked it and shipped the .so with the game (there will be a libSDL in the game directory somewhere), you can probably just save a copy of their SDL build and replace the original with a working copy if you're desperate to play ASAP.
If they statically-linked it, you're out of luck until they fix it, if you're not willing to do X11.
Honestly, what I don't get is why SDL would not do this automatically. I'd think that it'd just fall back until it hits a protocol that it can do. Historically, you shouldn't need to force SDL_VIDEODRIVER, because it'll use the first one available in your environment. Doesn't matter whether it's compiled with support for some environment you aren't using or not.
Maybe it was compiled with support and there's just some problem with said support.
EDIT: Ah, looks like they got it now. Apparently it's a bug in SDL, according to the issue you linked to, and they're pushing a patch for it.
Did you use SDL_VIDEODRIVER or SDL_VIDEO_DRIVER? The former one is the old parameter and the latter works. I am using it right now on a Wayland session.
Same issue switched to x11 and it worked fine. Even before it stopped launching it ran like shit on Wayland from launch. Real disappointing coming from Valve. If they can't properly support native linux support who can.
Not sure if it's coincidental timing, but I installed the Nvidia 535 driver at the same time as this update and was having the same sounding issue. I backed down to 525 as I have many times before and the game worked again. (I don't know what it is but the 535 driver hates my PC.)