I apologize for the delay. I didn't see your email responses to this thread. They went to a not-monitored address, but I was able to find the error messages you sent.
We are investigating further but are a little stumped as to what the cause of the issue is. We found one problem area when creating the URL for the open graph tags and are investigating another. That was fixed in the 9.2.4 version, which it looks like you installed already.
The issue is something with how SEF URLs are generated on your site. If we go to the non-SEF version of the placeholder #1 article on your site, the page loads fine:
index.php/en?option=com_content&view=article&id=1&catid=8
To investigate further, we need to understand a little more about your site. Can you send us admin credentials for the site? We don't know SP Page Builder that well, so I can't guarantee we can easily get to the bottom of the issue, but we'll gladly try. Some things we want to try:
* Test the article loading with a different template on the site
* Test turning off SEF URLs
* Check which other extensions are installed and possibly causing the problem
To send us the credentials, please use the Contact Us button at the top of this page and put them in there. That's a secure way to send them to our team.
Thanks,