I didn't realise that agent objects could be moved by mouse, but discovered by accident...
If you try, the playground crashes with this error message:
assisi_playground: enki/viewer/Viewer.cpp:65: Derived polymorphic_downcast(Base) [with Derived = Enki::ViewerWidget::ViewerUserData*; Base = Enki::PhysicalObject::UserData*]: Assertion `derived' failed.
Aborted (core dumped)
it seems to be the case for both bees and casus.