Moving a blueprint index page to a new space causes error 'The parent page specified does not exist' when adding new pages of that blueprint type

Steps to replicate

1. Create two spaces space foo and space bar
2. In space foo create a 'Product Requirements' page
3. Navigate to the 'Product Requirements' report page
4. Move this page to space bar
5. Click 'Add Requirements'
6. Enter a title for the page and hit save

Result

The following error appears:

The parent page specified does not exist. It may have been renamed or removed since you started editing.

Expected Result

The page should save

Really you shouldn't be able to move the page, because it opens up a plethora of problems and confusion.

Workaround

1. Move the child pages out of the Product Requirements report page if there are any
2. Remove the Product Requirements report page
3. Click Create->Product Requirements in the bar space
4. A new Product Requirements report page will be created, and any product requirements pages in that space should be displayed.