Oh, it’s just very, very likely that the periodic and the pivot reports are
incompatible. These reports are written just using format strings and
filtering on the backend -- in order to make them as easy to implement and
maintain as possible -- but not every possible combination has been tested,
and there are several that are known to be incompatible, unfortunately.
If you could open up an issue on GitHub with your input and the outputs you
expected to see, I’d be happy to put my AI on it to see if the problem is
perhaps an easy one to finish up by hand.
John