Changing freshly added repeater doesn't show up in form editor or state preview if delegate is an actual component

Changing freshly added repeater doesn't show up in form editor or state preview if delegate is an actual component. Changing model property value doesn't do anything, except in preview scene, where it works correctly. Fresh repeater works fine with implicit component delegates. If you close design mode and reopen it, then repeater works fine on editors also with actual component delegates.

To repro:

• Create new project
• Add Row item
• Add Repeater under the row
• Add Component item under root
• Add Rectangle under Component
• Set component as delegate of Repeater in property editor
• Set Repeater's model value to 5 

Expected: Row of 5 rectangles would be visible on form editor and state preview

Actual: Nothing is shown

Leave edit mode and come back: Rectangles are now visible.