Unfortunately, CiviCRM ``5.27`` and following broke the compatibility of the CustomField API(3), see [XCM-68](https://github.com/systopia/de.systopia.xcm/issues/68) and [CORE-1996](https://lab.civicrm.org/dev/core/-/issues/1996). If you're using CiviCRM ``5.27`` and up you will have to upgrade to ``XCM-1.8-alpha2`` or higher to avoid the issue.
