It seems that data for the numbers of commuting passengers in stops earlier than the current month are not saved: all games, even those that have been running for some time after these data started to be recorded, record commuting passenger data only in the most recent month.
I think I have fixed this. This was due to the fact that when the history content was changed, it tried to discard the previous record but discarded the latest record.
Please check the pull request #510.
This pull request also contains a commit to fix the network connection bug from Standard. For details, see this thread (https://forum.simutrans.com/index.php/topic,21444.msg199254.html#msg199254).
Thank you - now incorporated.