Text entered in the Completion Date sidebar prompt for Plot articles does not save. Entering a value causes the "saving/saved" checkmark to appear as normal, but the article has no completion date when viewed, and the prompt is unfilled and absent when the editor is returned to.

This occurs for both the new visual editor and the advanced editor that preceded it.

1. In the edit window of a plot-template article, open prompts.
2. Select the "Completion Date" prompt.
3. Close the prompts window and find the Completion Date sidebar element in the article.
4. Add text to the Completion Date box.
5. Wait for the article to save.
6. Select "View in world".
7. In the view page, the completion date field will be absent.
8. Switch back to editing the article. The completion date field will be missing.
9. Add it back in, fill it, alter some text elsewhere on the page. Wait for it to save.
10. View in world again. The new text elsewhere will be present, but the Completion Date field will be gone again.