If a content is moved from a "published" status to an "unpublished" status, the publication date is deleted. The reason for this is the placement of the content in question in the calendar. There are two date fields per content:

For "unpublished" content, the "planned publication date" applies in the calendar; for "published" content, the "publication date" applies. The "Publication Date" therefore has a higher priority and would continue to show the content in the calendar as published. Therefore, the publication date is deleted when the publication is withdrawn, i.e. the content goes "offline" again.

In this example, two jams are related to published content:

As long as the content changes between these two statuses, the publication date is retained. However, if it changes back to "In production", for example, it is deleted.