I added this tag in this way's corners in order to avoid "collapsing" of edges into a 1-D line when building a graph, which was, for some reason, what happened in our system before I added the tag.
Note that I replied with further explanations in the discussion you linked to.

Hey! sorry for the delay.
I will reply soon, both here and in the discussion. Thank you for the awareness!

I made this change a long time ago, and don't remember why and according to which indication :-)