There is a hard coded limit in a get_event function to obtain only 40 events. In result it displays only 40 events per month in the calendar month view. Also the export of the calendar is limiting the number of events.

In fact in the moodle code is maximum of events set to 50, otherwise it will raise an expection.

In a normal use case it is possible to have more than 40 or 50 events per month in your calendar to display or export, so it makes no sense to limit this.

It would be desirable to have no limit for this or a higher limit, like 1000 or it is possible to configure it in a moodle setting.

It probably affects all moodle versions.