When a cartesian chart specifies for one of its discrete cartesian axis a fixed categorical bands layout, through axis options like BandSize and BandSpacing, it is possible that the plot area does not occupy all of the available plot area, resulting in the plot panel becoming centered in the available space. In this case, the tick labels of the discrete cartesian axis have a wider margin to overflow to, without need to request for additional space.
The current discrete cartesian axis tick label overflow algorithm fails to recognize this and still asks for additional space to fit overflowing labels, as the attached image shows. Note the unnecessary margin on the right, intended to fit the overflow of the last tick's label.
To reproduce this issue, use the following chart specification: