PivotTable Functionality Removed from WorkDocs Online Excel

As of a month or two ago, it appears all new .xlsx files created in or moved to WorkDocs are missing the functionality for creating PivotTables. Older files that were around when that functionality was available still have access to it, but new files lose the option. There are no settings within Online Excel to enable/disable this functionality. Is there a way to restore PivotTable functionality within WorkDocs Excel files?