Unable to Drill Through Nested Hierarchies

Hello,
 
We observed that if we have nested hierarchies configured within the rows, we are not able to drill all the way through the inner hierarchy when any level of the outer hierarchy has been drilled through. However, if we drill-through the hierarchies, then we are able to drill all the way through. Is this the expected behavior? If so, is there someway we can drill all the way through nested hierarchies? We've prepared a video and jsFiddle for convenience.

• Video
• jsFiddle
  • We've left comments in the HTML on how to reproduce our observation, but in case something gets lost, we've copied the steps below:
    1. Drill through the Color level in any row
    2. Drill through the Size level from any of the resulting rows from step 1
    3. Expand out any of the resulting rows from step 2
    4. Drill through the Business Type level from the resulting row in step 3
       • At this point, we cannot drill all the way through Business Type despite it having one more level, Discount, beneath it.

 
Please let us know if you have any troubles opening the video or fiddle!
 
Kind regards,
Henry