I've got a build of oculus 4.22.3 branch from github. I've enabled vulkan, multiview is giving me black & multiview direct is just rendering the left eye. It's giving me a perf boost from 12 to 22ms (hey! I'm optimizing a huge scene don't hate!) - so I'd like to use it.
I saw that this was a glitch in unreal, but fixed with this patch. This patch is also in the oculus 4.22.3 build, but hasn't fixed it - at least in vulkan. https://github.com/EpicGames/UnrealEngine/commit/2036358f3a32c1a11c2923871fea6ede7a5991cd