When the Knowledge Service Portal is enabled and some navigation menus are added to it, after visiting the kb_search page, all URLs for subsequent Service Portal pages are trimmed, which causes an error.
Steps to Reproduce
Make sure that the Service Portal and Knowledge Management - Service Portal plugins are active.
For more information, see the documentation topic Activate a plugin.
Navigate to Service Portal > Portals and open the record for Service Portal (/sp).
Change the Homepage from index to kb_home.
Go to /sp and search for "email".
Choose Service Catalog in the header menu.
Open any catalog item.
Note that the error message "Item not found" is displayed and the catalog item does not open because the URL is missing parameters.
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Related Problem: PRB1156388