1) create 31 pages with a page property macro and label "test".
2) create page with page properties report and label "test", set "number of items to display" to 50
3) all pages were displayed on the report table
4) add a task report to one page property
5) the property report will now split in two pages. Although number of items to display is still 50, it will be broken at the 30th entry.

Similar to use a JIRA macro on page property (CONF-41462). Maybe the same problem technically?