If you're using Workspaces, an entity's workspace field will not be exported. This kind of sucks, because it's impossible to export a set content as a workspace, or set of workspaces.
The reason the field is skipped is because the workspace field is internal, and \Drupal\Core\TypedData\TypedDataInternalPropertiesHelper::getNonInternalProperties() specifically skips internal properties.
Consider making a special exception for the workspace field, and allow it to be exported despite being internal.
Active
2.0
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The default content exporter added to core 11.3.0 explicitly supports workspaces, both for import and export, and will preserve workspace relationships. I would suggest closing this in favor of using the core system: https://www.drupal.org/node/3533854 →