Adding progress manually in the reading journal of a book that was read in the past, correctly updates the calendar view with the dates read. However, the page count always goes from 0 to the last page read with every new entry. E.g. if I read from page 200 to 250 on a day, the "Update Progress" or the auto-update through API will count that as "50 pages read on this date", while doing a manual Reading journal entry will show 0->250 "250 page read on this date".