If there is a Pivot table report with a before filter on a date/time field - the filter is dropped from the breadcrumbs when opening link in new tab or window. 

1. Navigate to Report > Create New
2. Create a report with the following criteria
   • Type: Pivot
   • Rows: Assigned To
   • Columns: Assignment Group
   • Add a filter condition Created before 11/28/2017
3. Save the report
4. Click on one of the numbers in the grid
5. Note that the breadcrumbs contain Created < 2016-11-30 00:00:00
6. Return to the report and run it again
7. Right-click on the same number as before, and click Open Link in New Tab
8. Note that Created < 2016-11-30 00:00:00 is missing from the breadcrumbs

The workaround is to use the multilevel pivot instead of the pivot table.