Kibana Report is empty when adding a specific field

I am trying to generate a CSV report in Kibana (Version: 6.2.2).

When I filter out one specific field ("event.messages") the report is empty. There is no errors logged in the logs.
When I generate a report with all fields selected (without adding any fields at all) Kibana creates the report with success, including the "event.messages" field.

The only special about this field is that it contains a JSON object in an array which, as far as I know, is not well supported in Kibana. Is this the case or sth else (configuration?).

Hm. Yup. I just tested and confirmed this fails.

I opened an issue to track this here:

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