NGINX returns 404 error on page reload (Ember app)

I am using nginx to serve landing page, SPA (Ember), and Rails backend on same domain. All seems work well except when I refresh some SPA route, for example https://server_name.ru/app/login NGINX returns 404 error /home/aborovkov/apps/frontend/dist/login" failed. This doesn't happen when I enter this route manually, only after page refresh. How to fix this?

server {
        root /home/aborovkov/apps/landing;
        index index.html index.htm index.nginx-debian.html;
        try_files $uri $uri/ /index.html?/$request_uri;
        add_header Cache-Control "no-store, no-cache, must-revalidate, max-age=0";
        add_header Pragma "no-cache";

        server_name server_name.ru www.server_name.ru;
        access_log /etc/nginx/server_name.access.log;
        error_log /etc/nginx/server_name.error.log;

        location /app {
          alias  /home/aborovkov/apps/frontend/dist;
          index index.html index.htm index.nginx-debian.html
          try_files $uri $uri/ /index.html?/$request_uri;
          add_header Cache-Control "no-store, no-cache, must-revalidate, max-age=0";
          add_header Pragma "no-cache";
        }

        location /api/ {
          root /home/aborovkov/apps/api/current/public;
          proxy_pass  http://localhost:3000;

          passenger_enabled on;
          passenger_app_env production;
          client_max_body_size 100m;
        }

        listen [::]:443 ssl ipv6only=on; # managed by Certbot
        listen 443 ssl; # managed by Certbot
        ssl_certificate /etc/letsencrypt/live/server_name.ru/fullchain.pem; # managed by Certbot
        ssl_certificate_key /etc/letsencrypt/live/server_name.ru/privkey.pem; # managed by Certbot
        include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
        ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

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


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


        listen 80;
        listen [::]:80;

        server_name server_name.ru www.server_name.ru;
    return 404; # managed by Certbot
}