In my report, there are multiple stacked Panels. Each of them may fit on a single physical page. They all have KeepTogether set to True and I expected each of the Panels to start on a new page as two of them cannot fit on one page. This may not happen when I have Page sections though.

When I delete the PageHeader and/or PageFooter the Panels are displayed as expected. However, if I set the Visible of the Page sections to False, the problem persists.

It looks like the Page section's Height is taken into account when evaluating the KeepTogether behavior even for the pages where it is hidden. This shrinks the available physical area and the Reporting engine decides that the Panel cannot fit there, hence the next Panel starts from the current page rather than the next page as I think is correct.