@Maggard_Manda
May I suggest that you install the “Health Check & Troubleshooting” plugin and troubleshoot your sites.
This plugin will let you know what is in conflict with Weaver Xtreme without interfering with the live sites.
Given the number of sites running Xtreme and PHP 8.x without issues, it is likely that this is a conflict with one of your plugins which needs to be updated.
That said, it may be an old plugin which is no longer supported (updated) and cannot cope with PHP 8. In that case, you will need to replace it.
Regards!