when I make a pre-test, as Joomla recommend - I get several warnings, that your extensions may cause problems when upgrading to joomla 4.
eg all this below:
Extensions Pre-Update Check
[ More Detail ]Update Information Unavailable
Extension does not offer a compatible version for the selected target version of Joomla. This could mean the extension does not use the Joomla update system or the developer has not provided compatibility information for this Joomla version yet.
Extension Name Extension Type
SP Page Builder Admin Menu Modul
System - SP PageBuilder Potential Upgrade IssueMore Information Plugin
System - SP Page Builder Pro Updater Potential Upgrade IssueMore Information Plugin
SP Easy Image Gallery Module Modul
SP Simple Portfolio Module Modul
Smart Search - SP Page Builder Plugin
Search - SP Page Builder Plugin
Content - SP Page Builder Plugin
SP Page Builder Modul
SP Page Builder Modul
SP Simple Portfolio - SP Page Builder Plugin