The page title block is empty when rendered through a block reference field

Problem/Motivation

If a content type has a reference field for a Block configuration and the 'page title' block is selected then the title is not displayed. The page title block is rendered, however the content of the block is empty -

Steps to reproduce

1. Add a reference field of type block to any Content type (e.g Basic page)
- Select Other... under Reference - https://www.screencast.com/t/WA5wPSDU424q
- On the next page select Block under Configuration - https://www.screencast.com/t/cU4gnKGQ7aq0
2. Configure the field to be displayed as rendered entity
- Go to the Manage display page
- For the block reference field set Format: Rendered entity (View mode default) - https://www.screencast.com/t/ilK8DiqwJ
3. Create a new node and add the page title block to the reference field - https://www.screencast.com/t/XmTKHVnAJp
4. Navigate to the newly created page

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet