My thoughts too. I don't recall seeing this in 1.0 and there was a recent overhaul of the mapping, so there may be some refinement needed to make the map the computer is working with match the image it's showing. I don't usually let UFOs land except in the early game so it may be a issue that just went unnoticed.
The mod I'm working on involves at least one landing in most of the trajectories, so I'll probably be seeing it more now. I wanted to be sure it wasn't something I did before I went any further. The ruleset I posted with the save fit's what I'm trying to do for now so if that's not the cause I'll keep track of when/where it happens.