What's wrong with the config, HTTPS doesn't work?

Question

Nginx

I've been racking my brains for half a day, it doesn't work for the life of me.
exactly the same config from another site (on the same server) works - this one does not work
1. Does not pass validation here https://hstspreload.org/
2. swears that the www subdomain does not correspond to a certificate (although physically it is there is a server) but on mysite.com
3. how to issue a certificate to the www domain if it is explicitly specified without www in the config, how does another site work then? With the same config, it passes the hstspreload.org validation without any problems
4. maybe this hsts and the www domain?
Where is the mistake

server {
    if ($host = www.mysite.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = mysite.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

listen 80;
server_name mysite.com www.mysite.com;
return 301 https://mysite.com$request_uri;

}
server {
  listen 443 ssl http2;        
  server_name mysite.com www.mysite.com;
add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains; preload';
ssl_certificate /etc/letsencrypt/live/mysite.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/mysite.com/privkey.pem; # managed by Certbot
ssl_trusted_certificate /etc/letsencrypt/live/mysite.com/chain.pem;	
include /etc/letsencrypt/options-ssl-nginx.conf;
root   /var/www/mysite.com/web;

Answer 1

> 2. swears that the www subdomain does not have a certificate (although physically it is on the server), but
configure certbot on mysite.com so that it requests a certificate for both domains - with www and without www. it's in its settings.