How to run 2 nuxt project on the same server

I rent a ubuntu server from Digital Ocean, bought a domain name from Porkbun. I was hosting a nuxt project on localhost:3000 with pm2 one the server, used Nginx to proxy the port 80 to the localhost by configuring the /etc/nginx/sites-available/default file with the following code

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  root /var/www/html;

  index index.html index.htm index.nginx-debian.html;

  server_name _;

  location / {
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
  }
}

Now I would like to deploy another nuxt project on the same server, so I start a new app with pm2 on localhost:3001, then i added and new server block on the nginx config with server_name dev.mydomain.com and the proxy_pass HTTP://localhost:3001

However even no matter I add new DNS record on DigitalOcean or Porkbun, changing or adding the server_name on both server block with mydomain.com or dev.mydomain.com, I can only access the port 3000 nuxt project with mydomain.com

I don't know how should I do the config, i did add CNAME record for redirecting www.mydomain.com on DigitalOcean and porkbun before which worked fine, yet I deleted these records for testing the dev.mydomain.com and all these www. / dev. will redirect to the localhost:3000 nuxt project with the following config.

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  root /var/www/html;

  index index.html index.htm index.nginx-debian.html;

  server_name mydomain.com www.mydomain.com;

  location / {
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
  }
}
server {
  listen 80 default_server;
  listen [::]:80 default_server;

  root /var/www/html;

  index index.html index.htm index.nginx-debian.html;

  server_name dev.mydomain.com;

  location / {
    proxy_pass http://localhost:3001;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
  }
}