Pending approval read-only view broken for content block page

[brynwhyman]

Overview

When a content block page is pending approval, it goes into a read-only view for users who do not have permissions to approve or publish the page.

For content blocks, the UI styling is pretty rough. E.g:

Versions affected

CMS 4.6.0
Advanced Workflow 5.3
Elemental: 4.4
(note this probably occurs in earlier versions)