Preview journey in 24D doesn't include external URLs or learning enrollments?

Summary:

We are doing some testing of 24D and really like the new Preview function for journey templates, but curious as to why items such as external URLs or Learning Enrollments don't appear in the preview? Also, for every task it has a note saying "Task specific content goes here".

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24D

Code Snippet (add any code snippets that support your topic, if applicable):