Linux 4.26 version is not usable at all. It is crashes in a few seconds after startup on every other mouse click, menu open, window resize or close, on tooltip show - on any UI interactions.
Previous 4.25 version had legacy OpenGL mode which worked well but now it is dropped in favour of crappy Vulkan implementation.
Startup time is horrible - more than 100 seconds, which in combination with endless crashes makes 4.26 unusable on Linux.
Landscape support is broken in 4.26 with Vulkan - for landscapes with layers enabled and bigger than default section 64x64 quads, 1x1 section per component, 8x8 components, editing tools moving erratically and in game run mode collision with landscape is not detected.
Surprisingly on same Linux system WINDOWS version of 4.26 running under Wine 6.0 starts in 10 seconds and with DirectX to Vulkan calls translations works without any troubles at all.