mecha.contrib.statistics.Analyzer fails on macrolines

[knirch]

$  mecha -s macro/
Validating with mecha v0.98.1

Error: Plugin "mecha.contrib.statistics.Analyzer.finalize" raised an exception.

Traceback (most recent call last):
  File "/home/knirch/mecha/mecha/contrib/statistics.py", line 90, in finalize
    logger.info(str(Summary(mc.spec, self.stats)))
                ~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/knirch/mecha/mecha/contrib/statistics.py", line 169, in __str__
    return "\n".join(self.format())
           ~~~~~~~~~^^^^^^^^^^^^^^^
  File "/home/knirch/mecha/mecha/contrib/statistics.py", line 175, in format
    **self.format_commands(),
      ~~~~~~~~~~~~~~~~~~~~^^
  File "/home/knirch/mecha/mecha/contrib/statistics.py", line 189, in format_commands
    f" {' ' * len(prefix)}{self.spec.prototypes[identifier].usage()[len(prefix):]}",
                           ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
KeyError: 'mecha:sentinel'
$ cat macro/data/macro/function/macro.mcfunction
$say $(person) hates /say