Hi sero.va,
Sadly I am facing pretty similar issues like you. Trying to package with the 5.1 Oculus Branch using Vulkan. Any advice on this matter would be a huge help.
**UPDATE
So after checking my logs I spotted that mobile occlusion mentioned a few times in related to the error with shader compilation. So I disabled it in my project, tried to rebuild and it worked!
I hope this might be helpful.
