For issue reproducing

main.rs

use vulkano::library::*;
use vulkano::instance::*;
use vulkano::instance::debug::ValidationFeatureEnable;

fn main() {
    let library = VulkanLibrary::new().unwrap();

        let instance = Instance::new(
            library,
            InstanceCreateInfo {
                enabled_extensions: InstanceExtensions {
                    khr_surface: true,
                    khr_wayland_surface: true,
                    ext_validation_features: true,
                    ..InstanceExtensions::empty()
                },
                enabled_validation_features: vec![
                    ValidationFeatureEnable::DebugPrintf
                ],
                ..InstanceCreateInfo::default()
            },
        )
        .unwrap(); // Panics
}