This extension is missing and VkPhysicalDeviceVulkan12Features::bufferDeviceAddress return 0, so I'm wondering if there's a good reason for it.
I'm using Vulkan SDK 184.108.40.206, driver 21.5.2, RX Vega64 and Win7sp1.
I had a peak at gpuinfo.org and I see this extension available on all kinds of GCN devices going back to 2020, so shouldn't I have it?
Can you output the info from: vulkaninfoSDK.exe
Located in: VulkanSDK\220.127.116.11\Bin\vulkaninfoSDK.exe