Build results reports only show values for the master branch

It looks like all results from the build results reports page, when generating reports across multiple plans, are only for the master branches. There should be a way to report for other branches inside the build plan.

Currently the only way to get an overall report for non-master branches is to access them individually and look at the 'Branch statistics' section located at the right side of the screen:

This is affecting Bamboo 5.6-OD-01.