Vulkan Assertion failed: PixelShader VulkanPipelineState.cpp] [Line: 232]

Hi all, I just ran into a weird bug when deploying an APK for oculus quest. Everything was working normally a month ago, I made one tiny change to a BP today and then was seeing this when loading into one of my levels

Assertion failed: PixelShader [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/VulkanRHI/Private/VulkanPipelineState.cpp] [Line: 232]

The solution was to delete/regenerate my DerivedDataCache ( AppData\Local\UnrealEngine\Common )