I think something's broken with how Vulkan viewport renders alpha of baked gaussian splats. Simply speaking, alpha is rendered as a uniform color. Instead of acting like Alpha attribute, GS_Alpha uses currently selected Color Scheme's background color as its background, effectively obscuring all geometry and guides that are behind gaussian splats. Is this a known problem?

I’ve noticed something similar when working with baked Gaussian splats in the Vulkan viewport. The behavior you’re describing sounds more like a rendering issue with how the `GS_Alpha` attribute is being interpreted rather than the attribute itself. If the alpha is effectively replaced by the current Color Scheme background, it would explain why geometry and guides behind the splats become hidden.

It would be interesting to know whether the same baked splat renders correctly with another viewport renderer. Isoftmarts works with graphics and software workflows too, so these kinds of renderer-specific differences are definitely worth tracking down.