The last time I have restarted nginx after a minor change I came across this error:

Oct 02 15:48:57 v2202207179944196310 nginx[28113]: nginx: [emerg] could not build server_names_hash, you should increase server_names_hash_bucket_size: 32
Oct 02 15:48:57 v2202207179944196310 nginx[28113]: nginx: configuration file /etc/nginx/nginx.conf test failed

Here's a quick solution:

Edit /etc/nginx/nginx.conf (dont forget to backup it) to add or modify server_names_hash_bucket_size to increase the value in the http block:

http {
	
	...
	...
	server_names_hash_bucket_size 64;
	...
}

Test the config and restart service:

sudo nginx -t
sudo systemctl restart nginx

That solves the issue by allowing Nginx to handle more server blocks.