Error 500 just after running the migrate script on MODX 2.8.x

[Jako]

The VersionX 3 CMP throws the following error just after running the migrate script.

[01-Oct-2023 11:17:39 Europe/Berlin] PHP Fatal error:  Uncaught Error: Class "modmore\VersionX\VersionX" not found in /…/core/components/versionx/controllers/index.class.php:13

It does not occur on every installation and is not well reproducible, but it happens frequently on different installations.

PHP 8.1, MODX 2.8.x