I am trying to use a #autoedit on a form (rather than on a page) to edit a page that is not the one currently being edited by the form. (idea is to edit a page that refers in a template call to the one I am currently editing - and yes, that may be a sign of less-than-optimal data structure).
I set up a template to create the autoedit form. The template works when called from a page, but when called from a form it gives the following error:
"Modifying [] failed. No form specified. Will try to find the default form for the target page.
PHP 7.2.11 (cgi-fcgi)
Page Forms 4.5
No target page specified."
This may be related to T225473.