Drupal 7 redirect to fieldable-panels-panes after admin_menu Update

Today I'd like to share a nasty bug I ran into when updating a customer Drupal 7 CMS project. We updated several modules, one of them was admin_menu (7.x-3.0-rc5 > 7.x-3.0-rc6).
The website also used the "fieldable_panels_panes" module.

After update and cache clear admins were always redirected to /admin/structure/fieldable-panels-panes and it wasn't easy to figure out that that was caused by the latest admin_menu update.

So a rollback to 7.x-3.0-rc5 fixed that problem and incompatibility.

I couldn't find the issue in admin_menu yet, so if you can find it or also run into that problem, please let me know.