After upgrading to Version 4.3.0 of WPCloudDeploy some actions need to be taken on all your existing servers in order to add support for PHP 8.0 and to prevent future errors when we invoke PHP 8.0 specific routines:
If you are using server syncing, do not configure server sync to push server data from newer servers with PHP 8.0 to older destination servers! You should, instead, create a new destination server which will automatically have PHP 8.0 support installed.
Do not push sites using PHP 8.0 to existing destination servers that have not been updated to PHP 8.0