Syntax highlighting in the code block macro gets broken after navigating to a different page

Issue Summary

Issue can only be reproduced in the legacy editor

When the code block macro is inserted, it gives us the ability to choose which syntax to use for highlighting. The highlighting works just fine but it disappears if you navigate away to another page, then come back to the original page containing the code block macro.

Steps to Reproduce

1. Insert the code block macro on a legacy editor page
2. Select the appropriate syntax highlighting
3. Publish the page
4. Navigate to a different page in the page tree
5. Come back to the same page

Expected Results

Code block macro is working and syntax highlighting still works

Actual Results

Code block macro is working but syntax highlighting disappears

Workaround

Convert the page to use the new editor