Grayscale textures (LumaU8) showing up in red about nannou HOT 3 OPEN

// line 511 nannou_wgpu/src/texture/image.rs 
pub fn load_texture_from_image(
    device: &wgpu::Device,
    queue: &wgpu::Queue,
    usage: wgpu::TextureUsages,
    image: &image::DynamicImage,
) -> wgpu::Texture {
    use image::DynamicImage::*;
    match image {
        ImageLuma8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageLumaA8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageRgba8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageBgra8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageLuma16(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageLumaA16(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageRgba16(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageRgb8(_img) => {
            let img = image.to_rgba8();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
        ImageBgr8(_img) => {
            let img = image.to_bgra8();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
        ImageRgb16(_img) => {
            let img = image.to_rgba16();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
    }
}

pub fn load_texture_from_image(
    device: &wgpu::Device,
    queue: &wgpu::Queue,
    usage: wgpu::TextureUsages,
    image: &image::DynamicImage,
) -> wgpu::Texture {
    use image::DynamicImage::*;
    match image {
        ImageRgba8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageBgra8(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageRgba16(img) => load_texture_from_image_buffer(device, queue, usage, img),
        ImageRgb8(_img) => {
            let img = image.to_rgba8();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
        ImageBgr8(_img) => {
            let img = image.to_bgra8();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
        ImageRgb16(_img) => {
            let img = image.to_rgba16();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
        _ => {
            let img = image.to_rgba8();
            load_texture_from_image_buffer(device, queue, usage, &img)
        }
    }
}