Nginx Redirect from HTTP to HTTPS works in Firefox but not in Chrome

Question

with my Nginx configuration (see below) redirecting from http to https works fine when accessing the page (http://example.com/) with Firefox. But for some strange reason it does not work with Chrome.

server {
    listen                    80;
    server_name               example.com;
    return                    301 https://$server_name$request_uri;
}

server {
    listen                    443 ssl;
    server_name               example.com;
    server_tokens             off;
    ssl_certificate           /etc/nginx/ssl/example.com_fullchain1.pem;
    ssl_certificate_key       /etc/nginx/ssl/example.com_privkey1.pem;
    ssl_session_cache         builtin:1000  shared:SSL:10m;
    ssl_protocols             TLSv1.3;
    ssl_ciphers               "HIGH !aNULL !eNULL !EXPORT !CAMELLIA !DES !MD5 !PSK !RC4";
    ssl_prefer_server_ciphers on;
    access_log                /var/log/nginx/httpd-example.com.log;
}

Uuh, and when I look at the requests being send in the Dev Tools, it seems that Firefox (although I request http://example.com) just asks for https://example.com directly. Am I missing something?