Question about FP ground points in distant sectors

[a120471]

I try out the patchwork++ recently, and thanks for your efforts on this work. It's very efficiency and user-friendly. :)

However, I encountered some FP ground points. After diving into the implementation code, I find one particular line somewhat puzzling:
https://github.com/url-kaist/patchwork-plusplus/blob/master/cpp/patchworkpp/src/patchworkpp.cpp#L268

From my understanding, when using the default parameter num_rings_of_interest = 4, all distant sector ground points seem to be consistently included in the final ground. Which means if any distant sectors missed the ground points, there is a big chance that some FP points will be included.

Is this the intended behavior? Thanks.