Unimplemented action: POPPLER_ACTION_UNKNOWN
This is similar to #1446 (closed), but with a slightly newer version 3.36.7 of evince on Fedora 32. Opening the attached PDF form causes the message
** (evince:19573): WARNING **: 00:14:42.361: Unimplemented action: POPPLER_ACTION_UNKNOWN, please post a bug report in Evince issue tracker (https://gitlab.gnome.org/GNOME/evince/issues) with a testcase.
to appear three times in the terminal whence evince was started. Navigating futher down in the document produces more instances of the same warning (different time stamps, of course).
The PDF form is also publicly available at