Error validating the main servlet path in a content reference

Issue

• Following an upgrade from DXP 7.3 Service Pack 1 to Update 10, we cannot reference a main servlet path within a Basic Web Content article
  
  Steps to Demonstrate
  

  1. Create a new Basic Web Content article with this input
  Title: Test
  Content:

  Test content <a href="http://localhost:8080/c/portal/login">http://localhost:8080/c/portal/login</a>
  

  2. Press the Publish button
  
  Result

  The below error is thrown and the article isn't published

  Error: Unable to validate referenced page with URL /c/portal/login because the page group with URL /c cannot be found. 

Environment

• DXP 7.3 Update 10 (U10)

Resolution

• This behavior was found to be caused by a code regression
• It has since been fixed by LPS-180569, allowing a main servlet path to be referenced in content as before