AMD pays Blender at least $140,000 annually and after two years still no Vulkan support and Blender removes all support for AMD GPUs and optimized Blender for Nvidia exclusively. (Cycles X) :
Introduction To Vulkan API | Toptal®
Vulkan® - GPUOpen
New Feature Release - Vulkan - yuzu
Vulkan™ Graphics API | AMD
Doom: Vulkan vs OpenGL - AMD APU test (no discrete graphics card) - YouTube