Preview of conversion is broken

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.1 CE GA2, 7.3.2 CE GA3, 7.3.10 DXP GA1, Master
• Component/s: WCM
• Labels:
  • QA-AUTOMATION
• Fix Priority: 4
• Last Working Version:
  Master
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/86728
• QA Test Name:
  • LocalFile.ContentPageConverter#ConvertBasicWidgetPageToContentPage
  • LocalFile.ContentPageConverter#ConvertWidgetPageDecoratorsToContentPage
  • LocalFile.ContentPageConverter#ConvertWidgetPageWithCustomizableColumnContainingWidgets
  • LocalFile.ContentPageConverter#ConvertWidgetPageWithNonStandardLayout
  • LocalFile.ContentPageConverter#EditConvertedContentPageWithDecorator
  • LocalFile.ContentPageConverter#ViewAndEditConversionDraftPage
• QA Test Score: 30

Step to reproduce:

1. Site admin > Site Builder > Pages
2. Add a widget page
3. Back to Pages admin
4. Click the ellipsis of new page
5. Click Convert to content page...

Expected Results:
The preview of conversion should be shown on the screen.

Actual Results:
The preview of conversion is broken. The following error is thrown in the browser console.

Reproduced on:
Tomcat 9.0.17 + MySQL 5.7. Portal master GIT ID: 5424b300cd2d393e8a9d047b41c26cfb7c68bf2e.