Dumb question: why EVB for chip antenna has 2 feed lines, one unpopulated

[uer166]

I'm in a process of looking at suitable chip antennas to play in the 2.4G ISM range, and this chip antenna seems to have exceptionally high gain for its' size: https://abracon.com/datasheets/ACAG0801-2450-T.pdf, EVB: https://abracon.com/datasheets/ACAG0801-2450-EVB.pdf.

Looking at the EVB, they have 2 footprints on either end of PCBA, with only one populated. Question: wouldn't the unpopulated part cause unwanted reflections? Or maybe that is on purpose? Or maybe it's not connected at all? Can't tell from documentation. The idea of course is to copy the layout/stackup/FR4 material in own design.

[Marsupilami]

The trace right at the SMA connector is cut, so I'm guessing there is a jumper to only one side and the other is not connected.
The ground plane is part of the antenna so how the chip is placed in relation to it is important. What I'm guessing is they did the 2nd trace to give the user the ability to evaluate performance in the other orientation compared to the long edge of the board. (Educated guess only, listen to others if they know better.)