Output a new release?
Seahorse relies on libcryptui to display a signature after file verification. However, this is broken when the signing key has multiple subkeys. This was reported upstream: https://bugzilla.gnome.org/show_bug.cgi?id=774611 and a patch was merged into the master branch of libcryptui 3.20.
I think this behavior results in a UX issue, which makes it impossible for users using a GUI to be sure that a file is verified.
The last release of libcryptui is 3.12 and was published 4 years ago and I wonder if you plan to output a new release at some point, which would include this bug fix in particular?