Hello...
I have a site with the problem that the SP Builder Pro component does not save the changes made correctly, but the most important thing is that it does NOT allow any image to be assigned to the main page, IF changes can be made to the texts and positions of the modules, but assigning images produces an error and assigns the error page as the main one.
Note: due to this fielding in SP Builder Pro I have copied the main page three times to have backups.
I work with Joomla 4.4.0 and SP Builder Pro 5.1.9 and PHP 8.1
I have a video where I replicate the error, here is the link
https://youtu.be/ZvzBxB1fM0k