Field status is unknown

Problem/Motivation

The following error is triggered when the TMGMT module tries to publish an ECK entity without status field in Drupal\tmgmt_content\Plugin\tmgmt\Source\ContentEntitySource::doSaveTranslations():

InvalidArgumentException: Field status is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 616 of /[..]/web/core/lib/Drupal/Core/Entity/ContentEntityBase.php).

Proposed resolution

Check for the presence of a published key in the setPublished() / setUnpublished() methods.