Both parents of that merge commit work (one being your fork before you updated from GLFW master and one being stock GLFW without any changes you made).
I also reproduced this with a minimal C program that just calls GLFWInit + glfwVulkanSupported to confirm that it was the GLFW fork at fault rather than anything else in Walnut code.
It prints out
Aborted (Core Dumped)I ran it through GDB and found it crashed on this line: https://github.com/TheCherno/Walnut/blob/20f940b9d23946d4836b8549ff3e2c0750c5d985/Walnut/src/Walnut/Application.cpp#L421 (backtrace goes through GLFW code before ultimately throwing a SIGABRT in libvulkan.so).This merge commit of your GLFW fork is where it broke: d710a034f0667f97aa6cdfe78bf274b3b4f7aa63
Both parents of that merge commit work (one being your fork before you updated from GLFW master and one being stock GLFW without any changes you made).
I also reproduced this with a minimal C program that just calls GLFWInit + glfwVulkanSupported to confirm that it was the GLFW fork at fault rather than anything else in Walnut code.