I'm currrently building a table that breaks down Page Name dimension (custom) in a segment. The Visits metrics works fine, but when I add Bounce rate, a bunch of extra rows that are not included in the segment with value 0 are added to the table.
@beluks , this happens because the bounce rate calculation method works on a visit level. If you add Entries as the third metric, you will be surprised to see the numbers for the rows where the Visits and Bounce Rate return zero 🙂
For those who wonder how this happens, here is an example of the described situation: