Client script that populated variables in a variable set based on a filled in location stopped working after upgrading from Jakarta to London
The following error may be seen in this case:
"RangeError: Maximum call stack size exceeded" error
In London the name of a variable and the internal name of a variable set cannot be the same within a catalog item
Change the name of the variable or variable set.
London - Service Catalog release notes https://docs.servicenow.com/bundle/london-release-notes/page/release-notes/it-service-management/service-catalog-rn.html