Fix can't navigate to search results in another repo with config from LTS 2019

Using FF 96
Using a multi repo configuration

In Studio, using LTS 2019 target platform

• Configure a page provider using multirepo
• Confifure search form and results in Designer
• Configure a drawer entry for the search
• Switch to LTS 2021

Save and deploy

In Web UI

• Launch the search
• Try to navigate to a result in a different repo using a table listing
  => error 404

Expected:

• Can navigate to the document in the other repo
  OR
• If not possible, then the change to do should be documented in the upgrade notes and made easy to apply