System redirects to CMS/Edit page when editing Content Reference

Description

Steps to reproduce:

1. Go to the new Marketing UI.
2. Create a new discount which contains multiple content references.
3. Add some entries (categories, products, variants, etc.) to the Content Reference.
4. Select a content reference.
5. Select edit (or double click on a content reference).

Expected:
System opens "Select Content" window for user to select another content reference.

Actual:
System redirects to CMS/Edit page.