What happened was the idea was loaded (the model got attached) without a first meeting, then the first meeting was created separately in a different model. After creating the first meeting the second model had its object updated in place so no call to IModel#setObject was made. Even if it had been called since there was this separation the idea model would not have been updated either way. Implementing #setObject in the FirstMeetingModel (in FirstMeetingPanel) that would update the idea model would not have solved since its #setObject was never called.

To get around this we either have to update the idea models object in place (the chosen solution) or detaching it, forcing a reload from the database that would see the newly created first meeting.

@@ -173,0 +172,4 @@
+            FirstMeeting saved = firstMeetingRepository.save(getModelObject());
+            // After saving the first meeting we have to populate it on the already loaded idea to
+            // make sure that other places that want to render the first meeting get the correct data.
+            // An alternative would be to detach the idea model to force a database refresh.