This is a bit specific, so I don't know how easy it will be to reproduce.
I installed a wiki with both Semantic Forms and WikiEditor enabled.

The main page contains a input box to create a new page using a form and a template:

If I do the following:

• click to edit the page
• click on the "Preview" tab in the WikiEditor
• click publish

Then instead of seeing the edited page, I see a page titled "Add a page through a form", just as if I clicked on the forminput button. And my edits are not saved.

I have found that after enabling short urls the problem disappeared. I'm suspecting semantic for to hijack the POST request from wikieditor request.

Version: unspecified
Severity: normal
See Also:
T72057: wikiEditor not loading in a Semantic Form