使用 CF 的 HTTP/3 补丁安装 NGINX 并搭建了网站，为什么还是显示 HTTP/2 呢？

测试站点是：test.geeksky.org
各大浏览器均显示是 HTTP/2，各个 HTTP/3 测试工具均显示：无法建立 QUIC 连接。
系统防火墙已经关闭，安全组全部放行。
以下是操作全过程，希望大神能够指点迷津，不胜感激：

wget https://nginx.org/download/nginx-1.16.1.tar.gz
tar zxf nginx-1.16.1.tar.gz
git clone --recursive https://github.com/cloudflare/quiche
cd nginx-1.16.1
patch -p01 < /root/quiche/extras/nginx/nginx-1.16.patch
./configure --prefix=/usr/local/nginx --user=nobody --group=nobody --with-http_ssl_module --with-http_v2_module --with-http_v3_module --with-openssl=/root/quiche/deps/boringssl --with-quiche=/root/quiche && make && make install

下面是 NGINX 配置文件：

worker_processes  1;

events {
    use  epoll;
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    gzip  on;
    gzip_types  text/css application/javascript image/jpeg image/gif image/png image/webp;

    server {
        listen 443 quic reuseport;
        listen 443 ssl http2;
        server_name  test.geeksky.org;
        add_header alt-svc 'h3-25=":443"; ma=86400';

        ssl_certificate      /usr/local/nginx/ssl/www.crt;
        ssl_certificate_key  /usr/local/nginx/ssl/www.key;
        ssl_protocols        TLSv1.2 TLSv1.3;

        location / {
            root   html;
            index  index.html;
        }
    }
}