After Webmin/Virtualmin upgrade, certificate broken

SYSTEM INFORMATION
OS type and version Ubuntu Linux 24.04.4
Webmin version 2.651
Usermin version 2.550
Virtualmin version 8.1.0 GPL
Theme version 26.50.2
Apache version 2.4.58
Package updates All installed packages are up to date

In any domain I got this error-message after I’ve done a distribution upgrade from ubuntu 20.x to 24.04 (including the recent webmin upgrade)

Nginx-Host-File:

server {
	server_name myWebsite.de www.myWebsite.de;
	listen 78.47.141.18;
	root /home/myWebsite/public_html;
	index index.php index.htm index.html;
	access_log /var/log/virtualmin/myWebsite.de_access_log;
	error_log /var/log/virtualmin/myWebsite.de_error_log;
	fastcgi_param GATEWAY_INTERFACE CGI/1.1;
	fastcgi_param SERVER_SOFTWARE nginx;
	fastcgi_param QUERY_STRING $query_string;
	fastcgi_param REQUEST_METHOD $request_method;
	fastcgi_param CONTENT_TYPE $content_type;
	fastcgi_param CONTENT_LENGTH $content_length;
	fastcgi_param SCRIPT_FILENAME /home/myWebsite/public_html$fastcgi_script_name;
	fastcgi_param SCRIPT_NAME $fastcgi_script_name;
	fastcgi_param REQUEST_URI $request_uri;
	fastcgi_param DOCUMENT_URI $document_uri;
	fastcgi_param DOCUMENT_ROOT /home/myWebsite/public_html;
	fastcgi_param SERVER_PROTOCOL $server_protocol;
	fastcgi_param REMOTE_ADDR $remote_addr;
	fastcgi_param REMOTE_PORT $remote_port;
	fastcgi_param SERVER_ADDR $server_addr;
	fastcgi_param SERVER_PORT $server_port;
	fastcgi_param SERVER_NAME $server_name;
	fastcgi_param PATH_INFO $fastcgi_path_info;
	fastcgi_param HTTPS $https;
	location ~ \.php(/|$) {
		try_files $uri $fastcgi_script_name =404;
		fastcgi_pass unix:/var/php-nginx/16765612892125988.sock/socket;
	}
	fastcgi_split_path_info ^(.+\.php)(/.+)$;
	listen 78.47.141.18:443 ssl;
	ssl_certificate /home/myWebsite/ssl.cert;
	ssl_certificate_key /home/myWebsite/ssl.key;
}

What exactly is the issue here?

Hello,

What is the output of the webmin -V command on your system?