cubicweb #778725 cancel action doesn't work anymore for File edition [deprecated]

If I submit the form, a blank page with a raw form is displayed instead of the default entity view.

https://www.logilab.net/extranet/file/26966?vid=edition

priorityimportant
typebug
done in3.8.3
load0.000
load left0.000
closed by<not specified>