Hi there!
Pivot is an aggregating widget, so unless specified otherwise, the calculation is for the smallest aggregation.
So it is expected that the RSUM([Total net revenue]) formula will only calculate a running sum for the last dimension in the Rows section of the pivot.
However, using RSUM([Total net revenue],TRUE) formula should provide you with the results you are looking for, as it accumulates the sum continuously in the case of 2 dimensions or more. I've tested it myself and got the desired results.
In case this doesn't work as expected, I suggest submitting a ticket for Support to look into this further. Thank you!
Best Regards,
Volodymyr