TypeError when publishing journal article after editing template or structure in web content display portlet

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.0.0 DXP FP22, 7.0.0 DXP SP4, 7.0.X EE, 7.0.4 CE GA5, 7.1.X, Master
• Component/s: ~ [Archived] Frontend Infrastructure
• Labels:
  • QA-AUTOMATION
  • QA-NF
  • liferay-digital-enterprise-70-sp4
  • liferay-fixpack-de-22-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Last Working Version:
  7.0.0 DXP FP11
• Sprint: DeYoung
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/48314
• QA Test Name:
  • PGWebcontentdisplay#ChangeTemplate
  • WebcontentUsecase#AddWebContentViaWCDWithGlobalStructureAndLocalTemplate
  • WebcontentUsecase#EditArticleMadeFromGlobalStructure
  • WebcontentUsecase#EditGlobalWebContentTemplate
• QA Test Score: 16

Steps to reproduce:

1. Navigate to Content > Web Content
2. Add the following resources:
   • A web content article using the Basic Web Content structure and template
   • A new web content structure
   • A new web content template associated with the new structure
3. Add a web content display portlet
4. Select the basic web content article to be displayed in the portlet
5. Edit the web content article through the display portlet
6. Open the "Structure and Template" panel
7. Select either a new structure or template
8. Publish the article

Expected result: Article is published successfully; edit iframe is closed upon publishing, and the article is rendered using the new structure and template
Actual result: Clicking the "Publish" button throws a TypeError in the developer console:

TypeError: c.get(...) is undefined

Reproducible on:
Tomcat 8.0.32 + MySQL 5.7
Portal Master GIT ID: f8c4fbf9f33adb85e508dfe6b248420f152e63cb

Not Reproducible on:
Tomcat 8.0.32 + MySQL 5.7
Liferay DXP SP1 + SP11
Portal ee-7.0.x GIT ID: aabdce50c6752a338ddc01b47a4f496dedcf444d