Issue Summary

If we have a roadmap planner macro and we try to link a page that has a line break/ new line character on its title, the macro will break, causing the page to not be viewable/ editable.

Steps to Reproduce

1. Create a page A that contains a line break on its title
   The line break can be added either through copy+paste or by using the REST API
2. Create page B with a roadmap planner on it
3. Try to link page A on any of the roadmap's bars

Expected Results

The page should be linkable without problems

Actual Results

• Upon linking the page, it will display as broken macro:
• The page won't render on view mode with the following error:

  We couldn't display your content
  
  Refresh the page and try again. If the problem persists, contact Atlassian Support.

• And the page can't be edited with this error:

  We couldn't load the editor.
  Refresh the page and try again. If the problem persists, contact Atlassian Support.

• The below exception is thrown in the browser's console:

  Invalid adf document SyntaxError: Unexpected token < in JSON at position 0
      at Object.parse (<anonymous>)
      at ContentRenderer.tsx:31
      at ContentRenderer.tsx:100
      at Ji (react-dom.production.min.js:153)
      at Bs (react-dom.production.min.js:175)
      at Fs (react-dom.production.min.js:175)
      at xa (react-dom.production.min.js:268)
      at mu (react-dom.production.min.js:246)
      at vu (react-dom.production.min.js:246)
      at au (react-dom.production.min.js:239)

Workaround

Contact us through https://support.atlassian.com/ mentioning this bug and a link to the affected page so we can remove the broken link for you.
For support engineers: check the first internal comment for instructions.