The new Kubernetes Cost History Report does not support perspectives that were built to work with the old Containers Cost History Report.
Instead, you'll need to build a new perspective using assets listed under the Kubernetes (for FlexReports only) category:
Keep in mind that the new Kubernetes Cost History Report is built on top of FlexReports. This allows reporting to be MUCH more flexible with out of the box filtering, to the point where you may not even need perspectives to achieve your desired report!