I had another reproducable Vulkan CTD. It occured in the Wattmeer region, far northwesterly part of Germany. At first I thought this was caused by downloaded scenery / cultivation from different users that might not match or overlap. After some cleaning, it still occured. Then I removed everything there, even the official Helgoland scenery - still crashes. OpenGL works fine.
Last line in TM log always "-tmxgl: ERROR: (patch has no vertices)" (full file attached).